1398090628 has 18 divisors (see below), whose sum is σ = 2689303358. Its totient is φ = 635495520.

The previous prime is 1398090613. The next prime is 1398090653. The reversal of 1398090628 is 8260908931.

It can be written as a sum of positive squares in only one way, i.e., 816702084 + 581388544 = 28578^2 + 24112^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1443825 + ... + 1444792.

Almost surely, 2^1398090628 is an apocalyptic number.

It is an amenable number.

1398090628 is a deficient number, since it is larger than the sum of its proper divisors (1291212730).

1398090628 is a wasteful number, since it uses less digits than its factorization.

1398090628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888643 (or 2888630 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1398090628 is about 37391.0501056068. The cubic root of 1398090628 is about 1118.1801408604.

The spelling of 1398090628 in words is "one billion, three hundred ninety-eight million, ninety thousand, six hundred twenty-eight".