1250979540 has 24 divisors (see below), whose sum is σ = 3502742880. Its totient is φ = 333594528.

The previous prime is 1250979539. The next prime is 1250979547. The reversal of 1250979540 is 459790521.

It is a super-2 number, since 2×1250979540² = 3129899618997223200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1250979492 and 1250979501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1250979547) 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, 10424770 + ... + 10424889.

It is an arithmetic number, because the mean of its divisors is an integer number (145947620).

Almost surely, 2^1250979540 is an apocalyptic number.

1250979540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1250979540 is an abundant number, since it is smaller than the sum of its proper divisors (2251763340).

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

1250979540 is a wasteful number, since it uses less digits than its factorization.

1250979540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20849671 (or 20849669 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 42.

The square root of 1250979540 is about 35369.1891340472. The cubic root of 1250979540 is about 1077.4986522091.

The spelling of 1250979540 in words is "one billion, two hundred fifty million, nine hundred seventy-nine thousand, five hundred forty".