1399522418 has 18 divisors (see below), whose sum is σ = 2442670191. Its totient is φ = 599636604.

The previous prime is 1399522409. The next prime is 1399522441. The reversal of 1399522418 is 8142259931.

It can be written as a sum of positive squares in only one way, i.e., 699761209 + 699761209 = 26453^2 + 26453^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=26453.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 368453 + ... + 372231.

Almost surely, 2^1399522418 is an apocalyptic number.

1399522418 is a deficient number, since it is larger than the sum of its proper divisors (1043147773).

1399522418 is an frugal number, since it uses more digits than its factorization.

1399522418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7574 (or 3788 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 1399522418 is about 37410.1913654555. The cubic root of 1399522418 is about 1118.5617214944.

The spelling of 1399522418 in words is "one billion, three hundred ninety-nine million, five hundred twenty-two thousand, four hundred eighteen".