1389578372 has 24 divisors (see below), whose sum is σ = 2992938816. Its totient is φ = 549723168.

The previous prime is 1389578369. The next prime is 1389578383. The reversal of 1389578372 is 2738759831.

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, 1908398 + ... + 1909125.

It is an arithmetic number, because the mean of its divisors is an integer number (124705784).

Almost surely, 2^1389578372 is an apocalyptic number.

It is an amenable number.

1389578372 is an abundant number, since it is smaller than the sum of its proper divisors (1603360444).

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

1389578372 is a wasteful number, since it uses less digits than its factorization.

1389578372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3817547 (or 3817545 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 53.

The square root of 1389578372 is about 37277.0488638787. The cubic root of 1389578372 is about 1115.9061780129.

The spelling of 1389578372 in words is "one billion, three hundred eighty-nine million, five hundred seventy-eight thousand, three hundred seventy-two".