37640991 has 8 divisors (see below), whose sum is σ = 50384304. Its totient is φ = 24995840.

The previous prime is 37640929. The next prime is 37641001. The reversal of 37640991 is 19904673.

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 37640991 - 2¹⁵ = 37608223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37640191) 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, 23640 + ... + 25181.

It is an arithmetic number, because the mean of its divisors is an integer number (6298038).

Almost surely, 2^37640991 is an apocalyptic number.

37640991 is a deficient number, since it is larger than the sum of its proper divisors (12743313).

37640991 is a wasteful number, since it uses less digits than its factorization.

37640991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49081.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 37640991 is about 6135.2254237314. The cubic root of 37640991 is about 335.1354349541.

The spelling of 37640991 in words is "thirty-seven million, six hundred forty thousand, nine hundred ninety-one".