1290394864 has 20 divisors (see below), whose sum is σ = 2727425880. Its totient is φ = 586543040.

The previous prime is 1290394837. The next prime is 1290394873. The reversal of 1290394864 is 4684930921.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3665719 + ... + 3666070.

It is an arithmetic number, because the mean of its divisors is an integer number (136371294).

Almost surely, 2^1290394864 is an apocalyptic number.

It is an amenable number.

1290394864 is an abundant number, since it is smaller than the sum of its proper divisors (1437031016).

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

1290394864 is a wasteful number, since it uses less digits than its factorization.

1290394864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7331808 (or 7331802 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 1290394864 is about 35922.0665329822. The cubic root of 1290394864 is about 1088.6982928997.

It can be divided in two parts, 129039 and 4864, that added together give a triangular number (133903 = T₅₁₇).

The spelling of 1290394864 in words is "one billion, two hundred ninety million, three hundred ninety-four thousand, eight hundred sixty-four".