1025856440 has 64 divisors (see below), whose sum is σ = 2728900800. Its totient is φ = 339591168.

The previous prime is 1025856439. The next prime is 1025856463. The reversal of 1025856440 is 446585201.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1025856440.

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, 55049 + ... + 71288.

It is an arithmetic number, because the mean of its divisors is an integer number (42639075).

Almost surely, 2^1025856440 is an apocalyptic number.

1025856440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025856440 is an abundant number, since it is smaller than the sum of its proper divisors (1703044360).

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

1025856440 is a wasteful number, since it uses less digits than its factorization.

1025856440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126384 (or 126380 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 1025856440 is about 32028.9937400475. The cubic root of 1025856440 is about 1008.5455784040.

The spelling of 1025856440 in words is "one billion, twenty-five million, eight hundred fifty-six thousand, four hundred forty".