40591685 has 4 divisors (see below), whose sum is σ = 48710028. Its totient is φ = 32473344.

The previous prime is 40591667. The next prime is 40591697. The reversal of 40591685 is 58619504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6974881 + 33616804 = 2641^2 + 5798^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40591685 is a prime.

It is a super-2 number, since 2×40591685² = 3295369782278450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4059164 + ... + 4059173.

It is an arithmetic number, because the mean of its divisors is an integer number (12177507).

Almost surely, 2^40591685 is an apocalyptic number.

It is an amenable number.

40591685 is a deficient number, since it is larger than the sum of its proper divisors (8118343).

40591685 is an equidigital number, since it uses as much as digits as its factorization.

40591685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8118342.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 40591685 is about 6371.1604123582. The cubic root of 40591685 is about 343.6732209789.

The spelling of 40591685 in words is "forty million, five hundred ninety-one thousand, six hundred eighty-five".