9979957 has 6 divisors (see below), whose sum is σ = 10806882. Its totient is φ = 9212112.

The previous prime is 9979943. The next prime is 9979961. The reversal of 9979957 is 7599799.

It can be written as a sum of positive squares in 3 ways, for example, as 1418481 + 8561476 = 1191^2 + 2926^2 .

It is not a de Polignac number, because 9979957 - 2¹¹ = 9977909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9979898 and 9979907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29358 + ... + 29695.

It is an arithmetic number, because the mean of its divisors is an integer number (1801147).

Almost surely, 2^9979957 is an apocalyptic number.

It is an amenable number.

9979957 is a deficient number, since it is larger than the sum of its proper divisors (826925).

9979957 is a wasteful number, since it uses less digits than its factorization.

9979957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59079 (or 59066 counting only the distinct ones).

The product of its digits is 1607445, while the sum is 55.

The square root of 9979957 is about 3159.1069940729. The cubic root of 9979957 is about 215.2994349495.

It can be divided in two parts, 99799 and 57, that added together give a square (99856 = 316²).

The spelling of 9979957 in words is "nine million, nine hundred seventy-nine thousand, nine hundred fifty-seven".