33890409 has 72 divisors (see below), whose sum is σ = 61271808. Its totient is φ = 17962560.

The previous prime is 33890383. The next prime is 33890411. The reversal of 33890409 is 90409833.

It is not a de Polignac number, because 33890409 - 2¹² = 33886313 is a prime.

It is a super-2 number, since 2×33890409² = 2297119644374562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33890489) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 505794 + ... + 505860.

Almost surely, 2^33890409 is an apocalyptic number.

It is an amenable number.

33890409 is a deficient number, since it is larger than the sum of its proper divisors (27381399).

33890409 is a wasteful number, since it uses less digits than its factorization.

33890409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 33890409 is about 5821.5469593571. The cubic root of 33890409 is about 323.6127346024.

The spelling of 33890409 in words is "thirty-three million, eight hundred ninety thousand, four hundred nine".