33408981 has 12 divisors (see below), whose sum is σ = 48374508. Its totient is φ = 22218624.

The previous prime is 33408971. The next prime is 33408997. The reversal of 33408981 is 18980433.

It can be written as a sum of positive squares in 2 ways, for example, as 6937956 + 26471025 = 2634^2 + 5145^2 .

It is not a de Polignac number, because 33408981 - 2²² = 29214677 is a prime.

It is a super-2 number, since 2×33408981² = 2232320022916722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33408941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390 + ... + 8183.

It is an arithmetic number, because the mean of its divisors is an integer number (4031209).

Almost surely, 2^33408981 is an apocalyptic number.

It is an amenable number.

33408981 is a deficient number, since it is larger than the sum of its proper divisors (14965527).

33408981 is a wasteful number, since it uses less digits than its factorization.

33408981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9012 (or 9009 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 33408981 is about 5780.0502592971. The cubic root of 33408981 is about 322.0730676615.

It can be divided in two parts, 3340 and 8981, that added together give a palindrome (12321).

The spelling of 33408981 in words is "thirty-three million, four hundred eight thousand, nine hundred eighty-one".