33321390 has 16 divisors (see below), whose sum is σ = 79971408. Its totient is φ = 8885696.

The previous prime is 33321367. The next prime is 33321391. The reversal of 33321390 is 9312333.

It is a super-2 number, since 2×33321390² = 2220630063064200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 33321390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33321391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555327 + ... + 555386.

It is an arithmetic number, because the mean of its divisors is an integer number (4998213).

Almost surely, 2^33321390 is an apocalyptic number.

33321390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

33321390 is an abundant number, since it is smaller than the sum of its proper divisors (46650018).

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

33321390 is a wasteful number, since it uses less digits than its factorization.

33321390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110723.

The product of its (nonzero) digits is 1458, while the sum is 24.

The square root of 33321390 is about 5772.4682762229. The cubic root of 33321390 is about 321.7913530718.

Subtracting from 33321390 its sum of digits (24), we obtain a triangular number (33321366 = T₈₁₆₃).

The spelling of 33321390 in words is "thirty-three million, three hundred twenty-one thousand, three hundred ninety".