1390183988 has 6 divisors (see below), whose sum is σ = 2432821986. Its totient is φ = 695091992.

The previous prime is 1390183981. The next prime is 1390183999. The reversal of 1390183988 is 8893810931.

It can be written as a sum of positive squares in only one way, i.e., 855094564 + 535089424 = 29242^2 + 23132^2 .

It is a super-2 number, since 2×1390183988² = 3865223040983168288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390183981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173772995 + ... + 173773002.

It is an arithmetic number, because the mean of its divisors is an integer number (405470331).

Almost surely, 2^1390183988 is an apocalyptic number.

It is an amenable number.

1390183988 is a deficient number, since it is larger than the sum of its proper divisors (1042637998).

1390183988 is a wasteful number, since it uses less digits than its factorization.

1390183988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347546001 (or 347545999 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 1390183988 is about 37285.1711542270. The cubic root of 1390183988 is about 1116.0682685421.

The spelling of 1390183988 in words is "one billion, three hundred ninety million, one hundred eighty-three thousand, nine hundred eighty-eight".