1390138764 has 24 divisors (see below), whose sum is σ = 3707036928. Its totient is φ = 397182480.

The previous prime is 1390138723. The next prime is 1390138811. The reversal of 1390138764 is 4678310931.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 7 ways as a sum of consecutive naturals, for example, 8274552 + ... + 8274719.

It is an arithmetic number, because the mean of its divisors is an integer number (154459872).

Almost surely, 2^1390138764 is an apocalyptic number.

1390138764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1390138764 is an abundant number, since it is smaller than the sum of its proper divisors (2316898164).

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

1390138764 is a wasteful number, since it uses less digits than its factorization.

1390138764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16549285 (or 16549283 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 1390138764 is about 37284.5646883533. The cubic root of 1390138764 is about 1116.0561661587.

The spelling of 1390138764 in words is "one billion, three hundred ninety million, one hundred thirty-eight thousand, seven hundred sixty-four".