1290251278 has 16 divisors (see below), whose sum is σ = 2157077520. Its totient is φ = 575220096.

The previous prime is 1290251269. The next prime is 1290251317. The reversal of 1290251278 is 8721520921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998001 + ... + 999292.

It is an arithmetic number, because the mean of its divisors is an integer number (134817345).

Almost surely, 2^1290251278 is an apocalyptic number.

1290251278 is a deficient number, since it is larger than the sum of its proper divisors (866826242).

1290251278 is a wasteful number, since it uses less digits than its factorization.

1290251278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997331.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 1290251278 is about 35920.0679008267. The cubic root of 1290251278 is about 1088.6579105237.

The spelling of 1290251278 in words is "one billion, two hundred ninety million, two hundred fifty-one thousand, two hundred seventy-eight".