33390440 has 16 divisors (see below), whose sum is σ = 75128580. Its totient is φ = 13356160.

The previous prime is 33390433. The next prime is 33390443. The reversal of 33390440 is 4409333.

It can be written as a sum of positive squares in 2 ways, for example, as 29833444 + 3556996 = 5462^2 + 1886^2 .

It is a super-2 number, since 2×33390440² = 2229842966787200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33390443) 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, 417341 + ... + 417420.

Almost surely, 2^33390440 is an apocalyptic number.

It is an amenable number.

33390440 is an abundant number, since it is smaller than the sum of its proper divisors (41738140).

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

33390440 is a wasteful number, since it uses less digits than its factorization.

33390440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834772 (or 834768 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 33390440 is about 5778.4461579217. The cubic root of 33390440 is about 322.0134762823.

Adding to 33390440 its reverse (4409333), we get a palindrome (37799773).

The spelling of 33390440 in words is "thirty-three million, three hundred ninety thousand, four hundred forty".