155815398 has 12 divisors (see below), whose sum is σ = 337600068. Its totient is φ = 51938460.

The previous prime is 155815397. The next prime is 155815403. The reversal of 155815398 is 893518551.

155815398 is a `hidden beast` number, since 1 + 558 + 1 + 5 + 3 + 98 = 666.

155815398 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155815397) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4328188 + ... + 4328223.

It is an arithmetic number, because the mean of its divisors is an integer number (28133339).

Almost surely, 2^155815398 is an apocalyptic number.

155815398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

155815398 is an abundant number, since it is smaller than the sum of its proper divisors (181784670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155815398 is a wasteful number, since it uses less digits than its factorization.

155815398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8656419 (or 8656416 counting only the distinct ones).

The product of its digits is 216000, while the sum is 45.

The square root of 155815398 is about 12482.6038149098. The cubic root of 155815398 is about 538.1088372650.

The spelling of 155815398 in words is "one hundred fifty-five million, eight hundred fifteen thousand, three hundred ninety-eight".