1249405290 has 64 divisors (see below), whose sum is σ = 3807717120. Its totient is φ = 285577920.

The previous prime is 1249405273. The next prime is 1249405319. The reversal of 1249405290 is 925049421.

1249405290 is a `hidden beast` number, since 1 + 249 + 405 + 2 + 9 + 0 = 666.

It is a super-2 number, since 2×1249405290² = 3122027157359968200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 328641 + ... + 332420.

It is an arithmetic number, because the mean of its divisors is an integer number (59495580).

Almost surely, 2^1249405290 is an apocalyptic number.

1249405290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1249405290 is an abundant number, since it is smaller than the sum of its proper divisors (2558311830).

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

1249405290 is a wasteful number, since it uses less digits than its factorization.

1249405290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661084 (or 661078 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1249405290 is about 35346.9275892545. The cubic root of 1249405290 is about 1077.0464827355.

The spelling of 1249405290 in words is "one billion, two hundred forty-nine million, four hundred five thousand, two hundred ninety".