33921990 has 40 divisors (see below), whose sum is σ = 91214640. Its totient is φ = 9045648.

The previous prime is 33921989. The next prime is 33921997. The reversal of 33921990 is 9912933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33921997) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20130 + ... + 21749.

It is an arithmetic number, because the mean of its divisors is an integer number (2280366).

Almost surely, 2^33921990 is an apocalyptic number.

33921990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

33921990 is an abundant number, since it is smaller than the sum of its proper divisors (57292650).

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

33921990 is a wasteful number, since it uses less digits than its factorization.

33921990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41898 (or 41889 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 33921990 is about 5824.2587511202. The cubic root of 33921990 is about 323.7132236118.

The spelling of 33921990 in words is "thirty-three million, nine hundred twenty-one thousand, nine hundred ninety".