53399979 has 20 divisors (see below), whose sum is σ = 80128136. Its totient is φ = 35586864.

The previous prime is 53399947. The next prime is 53399981. The reversal of 53399979 is 97999335.

It is not a de Polignac number, because 53399979 - 2⁵ = 53399947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53399909) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18327 + ... + 21039.

Almost surely, 2^53399979 is an apocalyptic number.

53399979 is a deficient number, since it is larger than the sum of its proper divisors (26728157).

53399979 is an frugal number, since it uses more digits than its factorization.

53399979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740 (or 2716 counting only the distinct ones).

The product of its digits is 2066715, while the sum is 54.

The square root of 53399979 is about 7307.5289257040. The cubic root of 53399979 is about 376.5711362229.

The spelling of 53399979 in words is "fifty-three million, three hundred ninety-nine thousand, nine hundred seventy-nine".