33409840 has 20 divisors (see below), whose sum is σ = 77678064. Its totient is φ = 13363904.

The previous prime is 33409759. The next prime is 33409841. The reversal of 33409840 is 4890433.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×33409840² = 2232434817651200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33409841) 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, 208732 + ... + 208891.

Almost surely, 2^33409840 is an apocalyptic number.

It is an amenable number.

33409840 is an abundant number, since it is smaller than the sum of its proper divisors (44268224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

33409840 is a wasteful number, since it uses less digits than its factorization.

33409840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417636 (or 417630 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 33409840 is about 5780.1245661318. The cubic root of 33409840 is about 322.0758279811.

The spelling of 33409840 in words is "thirty-three million, four hundred nine thousand, eight hundred forty".