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155378789 = 19312511051
BaseRepresentation
bin10010100001011…
…10010001100101
3101211101001121222
421100232101211
5304234110124
623230150125
73564461246
oct1120562145
9354331558
10155378789
117a786425
1244052345
1326263217
14168c8ccd
15d99325e
hex942e465

155378789 has 16 divisors (see below), whose sum is σ = 169666560. Its totient is φ = 141750000.

The previous prime is 155378761. The next prime is 155378809. The reversal of 155378789 is 987873551.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-155378789 is a prime.

It is a super-2 number, since 2×1553787892 = 48285136142213042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155378789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155378089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147314 + ... + 148364.

It is an arithmetic number, because the mean of its divisors is an integer number (10604160).

Almost surely, 2155378789 is an apocalyptic number.

155378789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

155378789 is a deficient number, since it is larger than the sum of its proper divisors (14287771).

155378789 is a wasteful number, since it uses less digits than its factorization.

155378789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352.

The product of its digits is 2116800, while the sum is 53.

The square root of 155378789 is about 12465.1028475500. The cubic root of 155378789 is about 537.6057570160.

The spelling of 155378789 in words is "one hundred fifty-five million, three hundred seventy-eight thousand, seven hundred eighty-nine".

Divisors: 1 19 31 251 589 1051 4769 7781 19969 32581 147839 263801 619039 5012219 8177831 155378789