1539393864 has 64 divisors (see below), whose sum is σ = 4044902400. Its totient is φ = 487265856.

The previous prime is 1539393859. The next prime is 1539393881. The reversal of 1539393864 is 4683939351.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66697 + ... + 86759.

It is an arithmetic number, because the mean of its divisors is an integer number (63201600).

Almost surely, 2^1539393864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1539393864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2022451200).

1539393864 is an abundant number, since it is smaller than the sum of its proper divisors (2505508536).

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

1539393864 is a wasteful number, since it uses less digits than its factorization.

1539393864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20234 (or 20230 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 51.

The square root of 1539393864 is about 39235.1100928747. The cubic root of 1539393864 is about 1154.6488226033.

The spelling of 1539393864 in words is "one billion, five hundred thirty-nine million, three hundred ninety-three thousand, eight hundred sixty-four".