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18885157 is a prime number
BaseRepresentation
bin100100000001…
…0101000100101
31022112110120021
41020002220211
514313311112
61512435141
7316343524
oct110025045
938473507
1018885157
11a729775
1263a8ab1
133bb2b65
1427184bb
1519d0907
hex1202a25

18885157 has 2 divisors, whose sum is σ = 18885158. Its totient is φ = 18885156.

The previous prime is 18885149. The next prime is 18885203. The reversal of 18885157 is 75158881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13645636 + 5239521 = 3694^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 18885157 - 23 = 18885149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18885137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9442578 + 9442579.

It is an arithmetic number, because the mean of its divisors is an integer number (9442579).

Almost surely, 218885157 is an apocalyptic number.

It is an amenable number.

18885157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18885157 is an equidigital number, since it uses as much as digits as its factorization.

18885157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89600, while the sum is 43.

The square root of 18885157 is about 4345.7055813757. The cubic root of 18885157 is about 266.3014512600.

The spelling of 18885157 in words is "eighteen million, eight hundred eighty-five thousand, one hundred fifty-seven".