33420440 has 16 divisors (see below), whose sum is σ = 75196080. Its totient is φ = 13368160.

The previous prime is 33420407. The next prime is 33420451. The reversal of 33420440 is 4402433.

It is a happy number.

It is a super-2 number, since 2×33420440² = 2233851619587200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 417716 + ... + 417795.

It is an arithmetic number, because the mean of its divisors is an integer number (4699755).

Almost surely, 2^33420440 is an apocalyptic number.

It is an amenable number.

33420440 is an abundant number, since it is smaller than the sum of its proper divisors (41775640).

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

33420440 is a wasteful number, since it uses less digits than its factorization.

33420440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835522 (or 835518 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 33420440 is about 5781.0414286701. The cubic root of 33420440 is about 322.1098862384.

Adding to 33420440 its reverse (4402433), we get a palindrome (37822873).

The spelling of 33420440 in words is "thirty-three million, four hundred twenty thousand, four hundred forty".