40042615 has 4 divisors (see below), whose sum is σ = 48051144. Its totient is φ = 32034088.

The previous prime is 40042579. The next prime is 40042619. The reversal of 40042615 is 51624004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40042615 is a prime.

It is a super-2 number, since 2×40042615² = 3206822032076450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4004257 + ... + 4004266.

It is an arithmetic number, because the mean of its divisors is an integer number (12012786).

Almost surely, 2^40042615 is an apocalyptic number.

40042615 is a deficient number, since it is larger than the sum of its proper divisors (8008529).

40042615 is an equidigital number, since it uses as much as digits as its factorization.

40042615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8008528.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 40042615 is about 6327.9234350615. The cubic root of 40042615 is about 342.1165972722.

Adding to 40042615 its reverse (51624004), we get a palindrome (91666619).

The spelling of 40042615 in words is "forty million, forty-two thousand, six hundred fifteen".