40225918 has 4 divisors (see below), whose sum is σ = 60338880. Its totient is φ = 20112958.

The previous prime is 40225909. The next prime is 40225921. The reversal of 40225918 is 81952204.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 40225918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056478 + ... + 10056481.

It is an arithmetic number, because the mean of its divisors is an integer number (15084720).

Almost surely, 2^40225918 is an apocalyptic number.

40225918 is a deficient number, since it is larger than the sum of its proper divisors (20112962).

40225918 is a wasteful number, since it uses less digits than its factorization.

40225918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20112961.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 40225918 is about 6342.3905587720. The cubic root of 40225918 is about 342.6378382099.

The spelling of 40225918 in words is "forty million, two hundred twenty-five thousand, nine hundred eighteen".