33979621 has 4 divisors (see below), whose sum is σ = 36593452. Its totient is φ = 31365792.

The previous prime is 33979613. The next prime is 33979633. The reversal of 33979621 is 12697933.

33979621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20802721 + 13176900 = 4561^2 + 3630^2 .

It is a cyclic number.

It is not a de Polignac number, because 33979621 - 2³ = 33979613 is a prime.

It is a super-2 number, since 2×33979621² = 2309229286607282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33979601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1306896 + ... + 1306921.

It is an arithmetic number, because the mean of its divisors is an integer number (9148363).

Almost surely, 2^33979621 is an apocalyptic number.

It is an amenable number.

33979621 is a deficient number, since it is larger than the sum of its proper divisors (2613831).

33979621 is a wasteful number, since it uses less digits than its factorization.

33979621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613830.

The product of its digits is 61236, while the sum is 40.

The square root of 33979621 is about 5829.2041480806. The cubic root of 33979621 is about 323.8964416535.

The spelling of 33979621 in words is "thirty-three million, nine hundred seventy-nine thousand, six hundred twenty-one".