1249726440 has 64 divisors (see below), whose sum is σ = 3969725760. Its totient is φ = 313656320.

The previous prime is 1249726427. The next prime is 1249726477. The reversal of 1249726440 is 446279421.

It is a super-3 number, since 3×1249726440³ (a number of 28 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 304266 + ... + 308345.

It is an arithmetic number, because the mean of its divisors is an integer number (62026965).

Almost surely, 2^1249726440 is an apocalyptic number.

1249726440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1249726440 is an abundant number, since it is smaller than the sum of its proper divisors (2719999320).

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

1249726440 is a wasteful number, since it uses less digits than its factorization.

1249726440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612642 (or 612638 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 1249726440 is about 35351.4701250174. The cubic root of 1249726440 is about 1077.1387569955.

The spelling of 1249726440 in words is "one billion, two hundred forty-nine million, seven hundred twenty-six thousand, four hundred forty".