102639474 has 40 divisors (see below), whose sum is σ = 262846848. Its totient is φ = 29325240.

The previous prime is 102639461. The next prime is 102639479. The reversal of 102639474 is 474936201.

102639474 is a `hidden beast` number, since 10 + 2 + 639 + 4 + 7 + 4 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (102639479) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 44122 + ... + 46389.

Almost surely, 2^102639474 is an apocalyptic number.

102639474 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

102639474 is an abundant number, since it is smaller than the sum of its proper divisors (160207374).

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

102639474 is an equidigital number, since it uses as much as digits as its factorization.

102639474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90532 (or 90523 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 102639474 is about 10131.1141539319. The cubic root of 102639474 is about 468.2072553428.

The spelling of 102639474 in words is "one hundred two million, six hundred thirty-nine thousand, four hundred seventy-four".