102856440 has 32 divisors (see below), whose sum is σ = 308569680. Its totient is φ = 27428352.

The previous prime is 102856421. The next prime is 102856447. The reversal of 102856440 is 44658201.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 102856398 and 102856407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102856447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428449 + ... + 428688.

Almost surely, 2^102856440 is an apocalyptic number.

102856440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102856440 is an abundant number, since it is smaller than the sum of its proper divisors (205713240).

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

102856440 is a wasteful number, since it uses less digits than its factorization.

102856440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857151 (or 857147 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 102856440 is about 10141.8164053586. The cubic root of 102856440 is about 468.5369321436.

The spelling of 102856440 in words is "one hundred two million, eight hundred fifty-six thousand, four hundred forty".