155609838 has 12 divisors (see below), whose sum is σ = 337154688. Its totient is φ = 51869940.

The previous prime is 155609833. The next prime is 155609843. The reversal of 155609838 is 838906551.

155609838 is a `hidden beast` number, since 1 + 5 + 5 + 609 + 8 + 38 = 666.

It is an interprime number because it is at equal distance from previous prime (155609833) and next prime (155609843).

It is a junction number, because it is equal to n+sod(n) for n = 155609793 and 155609802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155609833) 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, 4322478 + ... + 4322513.

It is an arithmetic number, because the mean of its divisors is an integer number (28096224).

Almost surely, 2^155609838 is an apocalyptic number.

155609838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

155609838 is an abundant number, since it is smaller than the sum of its proper divisors (181544850).

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

155609838 is a wasteful number, since it uses less digits than its factorization.

155609838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8644999 (or 8644996 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 155609838 is about 12474.3672384614. The cubic root of 155609838 is about 537.8720991502.

The spelling of 155609838 in words is "one hundred fifty-five million, six hundred nine thousand, eight hundred thirty-eight".