1398135872 has 56 divisors (see below), whose sum is σ = 3256507584. Its totient is φ = 582999552.

The previous prime is 1398135863. The next prime is 1398135887. The reversal of 1398135872 is 2785318931.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25598 + ... + 58749.

Almost surely, 2^1398135872 is an apocalyptic number.

It is an amenable number.

1398135872 is an abundant number, since it is smaller than the sum of its proper divisors (1858371712).

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

1398135872 is an equidigital number, since it uses as much as digits as its factorization.

1398135872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84403 (or 84393 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The square root of 1398135872 is about 37391.6551118027. The cubic root of 1398135872 is about 1118.1922026432.

The spelling of 1398135872 in words is "one billion, three hundred ninety-eight million, one hundred thirty-five thousand, eight hundred seventy-two".