39042979 has 4 divisors (see below), whose sum is σ = 39155200. Its totient is φ = 38930760.

The previous prime is 39042923. The next prime is 39043001. The reversal of 39042979 is 97924093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97924093 = 61 ⋅1605313.

It is a cyclic number.

It is not a de Polignac number, because 39042979 - 2¹⁷ = 38911907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39042779) 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, 55587 + ... + 56284.

It is an arithmetic number, because the mean of its divisors is an integer number (9788800).

Almost surely, 2^39042979 is an apocalyptic number.

39042979 is a deficient number, since it is larger than the sum of its proper divisors (112221).

39042979 is a wasteful number, since it uses less digits than its factorization.

39042979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112220.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 39042979 is about 6248.4381248437. The cubic root of 39042979 is about 339.2456719672.

The spelling of 39042979 in words is "thirty-nine million, forty-two thousand, nine hundred seventy-nine".