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1395981 = 33149347
BaseRepresentation
bin101010100110100001101
32121220221000
411110310031
5324132411
645530513
714602626
oct5246415
92556830
101395981
11873904
12573a39
1339b532
14284a4d
151c8956
hex154d0d

1395981 has 16 divisors (see below), whose sum is σ = 2088000. Its totient is φ = 921744.

The previous prime is 1395943. The next prime is 1395983. The reversal of 1395981 is 1895931.

It is a happy number.

It is not a de Polignac number, because 1395981 - 29 = 1395469 is a prime.

It is a super-2 number, since 2×13959812 = 3897525904722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1395983) 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, 3850 + ... + 4196.

It is an arithmetic number, because the mean of its divisors is an integer number (130500).

21395981 is an apocalyptic number.

It is an amenable number.

1395981 is a deficient number, since it is larger than the sum of its proper divisors (692019).

1395981 is a wasteful number, since it uses less digits than its factorization.

1395981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505 (or 499 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1395981 is about 1181.5163985320. The cubic root of 1395981 is about 111.7617437323.

The spelling of 1395981 in words is "one million, three hundred ninety-five thousand, nine hundred eighty-one".

Divisors: 1 3 9 27 149 347 447 1041 1341 3123 4023 9369 51703 155109 465327 1395981