1256574540 has 48 divisors (see below), whose sum is σ = 3789057888. Its totient is φ = 309310464.

The previous prime is 1256574511. The next prime is 1256574551. The reversal of 1256574540 is 454756521.

1256574540 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 804717 + ... + 806276.

It is an arithmetic number, because the mean of its divisors is an integer number (78938706).

Almost surely, 2^1256574540 is an apocalyptic number.

1256574540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256574540 is an abundant number, since it is smaller than the sum of its proper divisors (2532483348).

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

1256574540 is a wasteful number, since it uses less digits than its factorization.

1256574540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611018 (or 1611016 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 39.

The square root of 1256574540 is about 35448.1951585691. The cubic root of 1256574540 is about 1079.1026325026.

The spelling of 1256574540 in words is "one billion, two hundred fifty-six million, five hundred seventy-four thousand, five hundred forty".