389406978415 has 32 divisors (see below), whose sum is σ = 580213823616. Its totient is φ = 244300492800.

The previous prime is 389406978283. The next prime is 389406978473. The reversal of 389406978415 is 514879604983.

It is not a de Polignac number, because 389406978415 - 2²¹ = 389404881263 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3735486 + ... + 3838315.

It is an arithmetic number, because the mean of its divisors is an integer number (18131681988).

Almost surely, 2^389406978415 is an apocalyptic number.

389406978415 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

389406978415 is a deficient number, since it is larger than the sum of its proper divisors (190806845201).

389406978415 is a wasteful number, since it uses less digits than its factorization.

389406978415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7573939.

The product of its (nonzero) digits is 52254720, while the sum is 64.

The spelling of 389406978415 in words is "three hundred eighty-nine billion, four hundred six million, nine hundred seventy-eight thousand, four hundred fifteen".