33640397 has 8 divisors (see below), whose sum is σ = 38489856. Its totient is φ = 28801872.

The previous prime is 33640379. The next prime is 33640417. The reversal of 33640397 is 79304633.

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 33640397 - 2¹⁴ = 33624013 is a prime.

It is a super-2 number, since 2×33640397² = 2263352620635218, 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 (33640337) 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, 5543 + ... + 9899.

It is an arithmetic number, because the mean of its divisors is an integer number (4811232).

Almost surely, 2^33640397 is an apocalyptic number.

It is an amenable number.

33640397 is a deficient number, since it is larger than the sum of its proper divisors (4849459).

33640397 is a wasteful number, since it uses less digits than its factorization.

33640397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5467.

The product of its (nonzero) digits is 40824, while the sum is 35.

The square root of 33640397 is about 5800.0342240370. The cubic root of 33640397 is about 322.8149982001.

The spelling of 33640397 in words is "thirty-three million, six hundred forty thousand, three hundred ninety-seven".