1399318820 has 12 divisors (see below), whose sum is σ = 2938569564. Its totient is φ = 559727520.

The previous prime is 1399318801. The next prime is 1399318831. The reversal of 1399318820 is 288139931.

It can be written as a sum of positive squares in 2 ways, for example, as 834400996 + 564917824 = 28886^2 + 23768^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34982951 + ... + 34982990.

It is an arithmetic number, because the mean of its divisors is an integer number (244880797).

Almost surely, 2^1399318820 is an apocalyptic number.

1399318820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399318820 is an abundant number, since it is smaller than the sum of its proper divisors (1539250744).

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

1399318820 is a wasteful number, since it uses less digits than its factorization.

1399318820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69965950 (or 69965948 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 1399318820 is about 37407.4701095917. The cubic root of 1399318820 is about 1118.5074772821.

The spelling of 1399318820 in words is "one billion, three hundred ninety-nine million, three hundred eighteen thousand, eight hundred twenty".