989421915 has 16 divisors (see below), whose sum is σ = 1583862048. Its totient is φ = 527429376.

The previous prime is 989421911. The next prime is 989421929. The reversal of 989421915 is 519124989.

It is not a de Polignac number, because 989421915 - 2² = 989421911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (989421911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16977 + ... + 47613.

It is an arithmetic number, because the mean of its divisors is an integer number (98991378).

Almost surely, 2^989421915 is an apocalyptic number.

989421915 is a deficient number, since it is larger than the sum of its proper divisors (594440133).

989421915 is a wasteful number, since it uses less digits than its factorization.

989421915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32798.

The product of its digits is 233280, while the sum is 48.

The square root of 989421915 is about 31455.0777299946. The cubic root of 989421915 is about 996.4614652071.

The spelling of 989421915 in words is "nine hundred eighty-nine million, four hundred twenty-one thousand, nine hundred fifteen".