33139979 has 4 divisors (see below), whose sum is σ = 33278880. Its totient is φ = 33001080.

The previous prime is 33139973. The next prime is 33140017. The reversal of 33139979 is 97993133.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 33139979 - 2⁸ = 33139723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33139973) 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, 69092 + ... + 69569.

It is an arithmetic number, because the mean of its divisors is an integer number (8319720).

Almost surely, 2^33139979 is an apocalyptic number.

33139979 is a deficient number, since it is larger than the sum of its proper divisors (138901).

33139979 is a wasteful number, since it uses less digits than its factorization.

33139979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138900.

The product of its digits is 137781, while the sum is 44.

The square root of 33139979 is about 5756.7333618989. The cubic root of 33139979 is about 321.2063159322.

The spelling of 33139979 in words is "thirty-three million, one hundred thirty-nine thousand, nine hundred seventy-nine".