102157818 has 32 divisors (see below), whose sum is σ = 237914496. Its totient is φ = 28636608.

The previous prime is 102157817. The next prime is 102157819. The reversal of 102157818 is 818751201.

It is an interprime number because it is at equal distance from previous prime (102157817) and next prime (102157819).

It is a super-2 number, since 2×102157818² = 20872439557042248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (102157817) 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, 20721 + ... + 25172.

It is an arithmetic number, because the mean of its divisors is an integer number (7434828).

Almost surely, 2^102157818 is an apocalyptic number.

102157818 is an abundant number, since it is smaller than the sum of its proper divisors (135756678).

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

102157818 is a wasteful number, since it uses less digits than its factorization.

102157818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45958.

The product of its (nonzero) digits is 4480, while the sum is 33.

The square root of 102157818 is about 10107.3150737473. The cubic root of 102157818 is about 467.4737217254.

The spelling of 102157818 in words is "one hundred two million, one hundred fifty-seven thousand, eight hundred eighteen".