40402685 has 4 divisors (see below), whose sum is σ = 48483228. Its totient is φ = 32322144.

The previous prime is 40402667. The next prime is 40402709. The reversal of 40402685 is 58620404.

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 19945156 + 20457529 = 4466^2 + 4523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40402685 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4040264 + ... + 4040273.

It is an arithmetic number, because the mean of its divisors is an integer number (12120807).

Almost surely, 2^40402685 is an apocalyptic number.

It is an amenable number.

40402685 is a deficient number, since it is larger than the sum of its proper divisors (8080543).

40402685 is an equidigital number, since it uses as much as digits as its factorization.

40402685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8080542.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 40402685 is about 6356.3106437618. The cubic root of 40402685 is about 343.1389957054.

The spelling of 40402685 in words is "forty million, four hundred two thousand, six hundred eighty-five".