978520389 has 32 divisors (see below), whose sum is σ = 1670608896. Its totient is φ = 494579520.

The previous prime is 978520373. The next prime is 978520393. The reversal of 978520389 is 983025879.

It is not a de Polignac number, because 978520389 - 2⁴ = 978520373 is a prime.

It is a super-2 number, since 2×978520389² = 1915004303377422642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978520789) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 48697 + ... + 65790.

It is an arithmetic number, because the mean of its divisors is an integer number (52206528).

Almost surely, 2^978520389 is an apocalyptic number.

It is an amenable number.

978520389 is a deficient number, since it is larger than the sum of its proper divisors (692088507).

978520389 is a wasteful number, since it uses less digits than its factorization.

978520389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114545.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The square root of 978520389 is about 31281.3105384030. The cubic root of 978520389 is about 992.7882452870.

The spelling of 978520389 in words is "nine hundred seventy-eight million, five hundred twenty thousand, three hundred eighty-nine".