33990905 has 32 divisors (see below), whose sum is σ = 48988800. Its totient is φ = 22367232.

The previous prime is 33990899. The next prime is 33990919. The reversal of 33990905 is 50909933.

It is a cyclic number.

It is not a de Polignac number, because 33990905 - 2⁴ = 33990889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20186 + ... + 21804.

It is an arithmetic number, because the mean of its divisors is an integer number (1530900).

Almost surely, 2^33990905 is an apocalyptic number.

It is an amenable number.

33990905 is a deficient number, since it is larger than the sum of its proper divisors (14997895).

33990905 is a wasteful number, since it uses less digits than its factorization.

33990905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673.

The product of its (nonzero) digits is 32805, while the sum is 38.

The square root of 33990905 is about 5830.1719528673. The cubic root of 33990905 is about 323.9322910131.

The spelling of 33990905 in words is "thirty-three million, nine hundred ninety thousand, nine hundred five".