102100440 has 64 divisors (see below), whose sum is σ = 329868000. Its totient is φ = 25132032.

The previous prime is 102100421. The next prime is 102100451. The reversal of 102100440 is 44001201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31165 + ... + 34284.

Almost surely, 2^102100440 is an apocalyptic number.

102100440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102100440 is an abundant number, since it is smaller than the sum of its proper divisors (227767560).

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

102100440 is a wasteful number, since it uses less digits than its factorization.

102100440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65476 (or 65472 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 102100440 is about 10104.4762358076. The cubic root of 102100440 is about 467.3861848436.

Adding to 102100440 its reverse (44001201), we get a palindrome (146101641).

The spelling of 102100440 in words is "one hundred two million, one hundred thousand, four hundred forty".