1290138764 has 6 divisors (see below), whose sum is σ = 2257742844. Its totient is φ = 645069380.

The previous prime is 1290138763. The next prime is 1290138769. The reversal of 1290138764 is 4678310921.

It is not an unprimeable number, because it can be changed into a prime (1290138763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161267342 + ... + 161267349.

It is an arithmetic number, because the mean of its divisors is an integer number (376290474).

Almost surely, 2^1290138764 is an apocalyptic number.

It is an amenable number.

1290138764 is a deficient number, since it is larger than the sum of its proper divisors (967604080).

1290138764 is a wasteful number, since it uses less digits than its factorization.

1290138764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322534695 (or 322534693 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1290138764 is about 35918.5016948090. The cubic root of 1290138764 is about 1088.6262647973.

The spelling of 1290138764 in words is "one billion, two hundred ninety million, one hundred thirty-eight thousand, seven hundred sixty-four".