33423440 has 20 divisors (see below), whose sum is σ = 77709684. Its totient is φ = 13369344.

The previous prime is 33423437. The next prime is 33423473. The reversal of 33423440 is 4432433.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19465744 + 13957696 = 4412^2 + 3736^2 .

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

It is a super-2 number, since 2×33423440² = 2234252682867200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208817 + ... + 208976.

Almost surely, 2^33423440 is an apocalyptic number.

It is an amenable number.

33423440 is an abundant number, since it is smaller than the sum of its proper divisors (44286244).

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

33423440 is a wasteful number, since it uses less digits than its factorization.

33423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417806 (or 417800 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 23.

The square root of 33423440 is about 5781.3008916679. The cubic root of 33423440 is about 322.1195240603.

Adding to 33423440 its reverse (4432433), we get a palindrome (37855873).

The spelling of 33423440 in words is "thirty-three million, four hundred twenty-three thousand, four hundred forty".