1398431408 has 20 divisors (see below), whose sum is σ = 2955775848. Its totient is φ = 635650560.

The previous prime is 1398431401. The next prime is 1398431413. The reversal of 1398431408 is 8041348931.

It is a super-2 number, since 2×1398431408² = 3911220805761724928, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1398431401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3972641 + ... + 3972992.

Almost surely, 2^1398431408 is an apocalyptic number.

It is an amenable number.

1398431408 is an abundant number, since it is smaller than the sum of its proper divisors (1557344440).

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

1398431408 is a wasteful number, since it uses less digits than its factorization.

1398431408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7945652 (or 7945646 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 1398431408 is about 37395.6068007995. The cubic root of 1398431408 is about 1118.2709843925.

The spelling of 1398431408 in words is "one billion, three hundred ninety-eight million, four hundred thirty-one thousand, four hundred eight".