40392591 has 4 divisors (see below), whose sum is σ = 53856792. Its totient is φ = 26928392.

The previous prime is 40392589. The next prime is 40392601. The reversal of 40392591 is 19529304.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40392591 - 2¹ = 40392589 is a prime.

It is a super-2 number, since 2×40392591² = 3263122815386562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40392511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6732096 + ... + 6732101.

It is an arithmetic number, because the mean of its divisors is an integer number (13464198).

Almost surely, 2^40392591 is an apocalyptic number.

40392591 is a deficient number, since it is larger than the sum of its proper divisors (13464201).

40392591 is a wasteful number, since it uses less digits than its factorization.

40392591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13464200.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 40392591 is about 6355.5165801058. The cubic root of 40392591 is about 343.1104172953.

The spelling of 40392591 in words is "forty million, three hundred ninety-two thousand, five hundred ninety-one".