155398257 has 72 divisors (see below), whose sum is σ = 280180992. Its totient is φ = 85730400.

The previous prime is 155398249. The next prime is 155398267. The reversal of 155398257 is 752893551.

155398257 is a `hidden beast` number, since 1 + 5 + 5 + 398 + 257 = 666.

It is not a de Polignac number, because 155398257 - 2³ = 155398249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155398267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 368907 + ... + 369327.

Almost surely, 2^155398257 is an apocalyptic number.

It is an amenable number.

155398257 is a deficient number, since it is larger than the sum of its proper divisors (124782735).

155398257 is an equidigital number, since it uses as much as digits as its factorization.

155398257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 462 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The square root of 155398257 is about 12465.8837231863. The cubic root of 155398257 is about 537.6282089690.

The spelling of 155398257 in words is "one hundred fifty-five million, three hundred ninety-eight thousand, two hundred fifty-seven".