1249905868 has 18 divisors (see below), whose sum is σ = 2218612508. Its totient is φ = 616140840.

The previous prime is 1249905851. The next prime is 1249905883. The reversal of 1249905868 is 8685099421.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10830 + ... + 51157.

Almost surely, 2^1249905868 is an apocalyptic number.

It is an amenable number.

1249905868 is a deficient number, since it is larger than the sum of its proper divisors (968706640).

1249905868 is an equidigital number, since it uses as much as digits as its factorization.

1249905868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62133 (or 62060 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 52.

The square root of 1249905868 is about 35354.0078067537. The cubic root of 1249905868 is about 1077.1903041710.

The spelling of 1249905868 in words is "one billion, two hundred forty-nine million, nine hundred five thousand, eight hundred sixty-eight".