40643815 has 8 divisors (see below), whose sum is σ = 49907088. Its totient is φ = 31758720.

The previous prime is 40643809. The next prime is 40643839. The reversal of 40643815 is 51834604.

It is a happy number.

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

It is not a de Polignac number, because 40643815 - 2³ = 40643807 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 94306 + ... + 94735.

It is an arithmetic number, because the mean of its divisors is an integer number (6238386).

Almost surely, 2^40643815 is an apocalyptic number.

40643815 is a deficient number, since it is larger than the sum of its proper divisors (9263273).

40643815 is a wasteful number, since it uses less digits than its factorization.

40643815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189089.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 40643815 is about 6375.2501911690. The cubic root of 40643815 is about 343.8202791843.

The spelling of 40643815 in words is "forty million, six hundred forty-three thousand, eight hundred fifteen".