33990431 has 8 divisors (see below), whose sum is σ = 34678800. Its totient is φ = 33305920.

The previous prime is 33990427. The next prime is 33990433. The reversal of 33990431 is 13409933.

33990431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 33990431 - 2² = 33990427 is a prime.

It is a super-2 number, since 2×33990431² = 2310698799131522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33990433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22211 + ... + 23691.

It is an arithmetic number, because the mean of its divisors is an integer number (4334850).

Almost surely, 2^33990431 is an apocalyptic number.

33990431 is a deficient number, since it is larger than the sum of its proper divisors (688369).

33990431 is a wasteful number, since it uses less digits than its factorization.

33990431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 33990431 is about 5830.1313021235. The cubic root of 33990431 is about 323.9307852709.

The spelling of 33990431 in words is "thirty-three million, nine hundred ninety thousand, four hundred thirty-one".