989938957 has 16 divisors (see below), whose sum is σ = 1163796480. Its totient is φ = 824452848.

The previous prime is 989938949. The next prime is 989939039. The reversal of 989938957 is 759839989.

It is a cyclic number.

It is not a de Polignac number, because 989938957 - 2³ = 989938949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 989938892 and 989938901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989938357) 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, 34908 + ... + 56554.

It is an arithmetic number, because the mean of its divisors is an integer number (72737280).

Almost surely, 2^989938957 is an apocalyptic number.

It is an amenable number.

989938957 is a deficient number, since it is larger than the sum of its proper divisors (173857523).

989938957 is a wasteful number, since it uses less digits than its factorization.

989938957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21840.

The product of its digits is 44089920, while the sum is 67.

The square root of 989938957 is about 31463.2953932038. The cubic root of 989938957 is about 996.6350085332.

The spelling of 989938957 in words is "nine hundred eighty-nine million, nine hundred thirty-eight thousand, nine hundred fifty-seven".