40000015 has 8 divisors (see below), whose sum is σ = 52363728. Its totient is φ = 29090880.

The previous prime is 40000003. The next prime is 40000021. The reversal of 40000015 is 51000004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40000015 - 2⁵ = 39999983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39999956 and 40000010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363582 + ... + 363691.

It is an arithmetic number, because the mean of its divisors is an integer number (6545466).

Almost surely, 2^40000015 is an apocalyptic number.

40000015 is a deficient number, since it is larger than the sum of its proper divisors (12363713).

40000015 is a wasteful number, since it uses less digits than its factorization.

40000015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727289.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 40000015 is about 6324.5565061908. The cubic root of 40000015 is about 341.9952320847.

Adding to 40000015 its reverse (51000004), we get a palindrome (91000019).

The spelling of 40000015 in words is "forty million, fifteen", and thus it is an aban number and an uban number.