9979620 has 48 divisors (see below), whose sum is σ = 31936128. Its totient is φ = 2280960.

The previous prime is 9979609. The next prime is 9979621. The reversal of 9979620 is 269799.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (9979621) 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, 11461 + ... + 12300.

It is an arithmetic number, because the mean of its divisors is an integer number (665336).

Almost surely, 2^9979620 is an apocalyptic number.

It is an amenable number.

9979620 is an abundant number, since it is smaller than the sum of its proper divisors (21956508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9979620 is a wasteful number, since it uses less digits than its factorization.

9979620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23780 (or 23778 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 9979620 is about 3159.0536557647. The cubic root of 9979620 is about 215.2970115347.

The spelling of 9979620 in words is "nine million, nine hundred seventy-nine thousand, six hundred twenty".