39477979 has 4 divisors (see below), whose sum is σ = 40317984. Its totient is φ = 38637976.

The previous prime is 39477967. The next prime is 39477983. The reversal of 39477979 is 97977493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97977493 = 23 ⋅4259891.

It is a cyclic number.

It is not a de Polignac number, because 39477979 - 2²³ = 31089371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39477929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419932 + ... + 420025.

It is an arithmetic number, because the mean of its divisors is an integer number (10079496).

Almost surely, 2^39477979 is an apocalyptic number.

39477979 is a deficient number, since it is larger than the sum of its proper divisors (840005).

39477979 is an equidigital number, since it uses as much as digits as its factorization.

39477979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840004.

The product of its digits is 3000564, while the sum is 55.

The square root of 39477979 is about 6283.1504040569. The cubic root of 39477979 is about 340.5009311524.

The spelling of 39477979 in words is "thirty-nine million, four hundred seventy-seven thousand, nine hundred seventy-nine".