33997990 has 16 divisors (see below), whose sum is σ = 65904048. Its totient is φ = 12553056.

The previous prime is 33997981. The next prime is 33997991. The reversal of 33997990 is 9979933.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33997991) 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, 130632 + ... + 130891.

It is an arithmetic number, because the mean of its divisors is an integer number (4119003).

Almost surely, 2^33997990 is an apocalyptic number.

33997990 is a deficient number, since it is larger than the sum of its proper divisors (31906058).

33997990 is a wasteful number, since it uses less digits than its factorization.

33997990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261543.

The product of its (nonzero) digits is 413343, while the sum is 49.

The square root of 33997990 is about 5830.7795362198. The cubic root of 33997990 is about 323.9547960610.

It can be divided in two parts, 3 and 3997990, that added together give a palindrome (3997993).

The spelling of 33997990 in words is "thirty-three million, nine hundred ninety-seven thousand, nine hundred ninety".