1389578331 has 8 divisors (see below), whose sum is σ = 1853747280. Its totient is φ = 925897472.

The previous prime is 1389578299. The next prime is 1389578347. The reversal of 1389578331 is 1338759831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1389578331 - 2⁵ = 1389578299 is a prime.

It is a super-2 number, since 2×1389578331² = 3861855875969491122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1389578831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115326 + ... + 126803.

It is an arithmetic number, because the mean of its divisors is an integer number (231718410).

Almost surely, 2^1389578331 is an apocalyptic number.

1389578331 is a deficient number, since it is larger than the sum of its proper divisors (464168949).

1389578331 is a wasteful number, since it uses less digits than its factorization.

1389578331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244045.

The product of its digits is 544320, while the sum is 48.

The square root of 1389578331 is about 37277.0483139425. The cubic root of 1389578331 is about 1115.9061670379.

The spelling of 1389578331 in words is "one billion, three hundred eighty-nine million, five hundred seventy-eight thousand, three hundred thirty-one".