40297685 has 4 divisors (see below), whose sum is σ = 48357228. Its totient is φ = 32238144.

The previous prime is 40297669. The next prime is 40297703. The reversal of 40297685 is 58679204.

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 30724849 + 9572836 = 5543^2 + 3094^2 .

It is a cyclic number.

It is not a de Polignac number, because 40297685 - 2⁴ = 40297669 is a prime.

It is a Duffinian number.

It is a Curzon 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, 4029764 + ... + 4029773.

It is an arithmetic number, because the mean of its divisors is an integer number (12089307).

Almost surely, 2^40297685 is an apocalyptic number.

It is an amenable number.

40297685 is a deficient number, since it is larger than the sum of its proper divisors (8059543).

40297685 is an equidigital number, since it uses as much as digits as its factorization.

40297685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8059542.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 40297685 is about 6348.0457622799. The cubic root of 40297685 is about 342.8414837012.

The spelling of 40297685 in words is "forty million, two hundred ninety-seven thousand, six hundred eighty-five".