1286921490 has 32 divisors (see below), whose sum is σ = 3251171520. Its totient is φ = 325116864.

The previous prime is 1286921477. The next prime is 1286921521. The reversal of 1286921490 is 941296821.

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, 1128309 + ... + 1129448.

It is an arithmetic number, because the mean of its divisors is an integer number (101599110).

Almost surely, 2^1286921490 is an apocalyptic number.

1286921490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1286921490 is an abundant number, since it is smaller than the sum of its proper divisors (1964250030).

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

1286921490 is a wasteful number, since it uses less digits than its factorization.

1286921490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257786.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 1286921490 is about 35873.6879899461. The cubic root of 1286921490 is about 1087.7205936442.

The spelling of 1286921490 in words is "one billion, two hundred eighty-six million, nine hundred twenty-one thousand, four hundred ninety".