102155238 has 48 divisors (see below), whose sum is σ = 226555056. Its totient is φ = 33259200.

The previous prime is 102155237. The next prime is 102155239. The reversal of 102155238 is 832551201.

It is a happy number.

102155238 is a `hidden beast` number, since 102 + 1 + 552 + 3 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (102155237) and next prime (102155239).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102155237) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150556 + ... + 151232.

It is an arithmetic number, because the mean of its divisors is an integer number (4719897).

Almost surely, 2^102155238 is an apocalyptic number.

102155238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

102155238 is an abundant number, since it is smaller than the sum of its proper divisors (124399818).

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

102155238 is a wasteful number, since it uses less digits than its factorization.

102155238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 102155238 is about 10107.1874426074. The cubic root of 102155238 is about 467.4697863361.

The spelling of 102155238 in words is "one hundred two million, one hundred fifty-five thousand, two hundred thirty-eight".