4005918 has 24 divisors (see below), whose sum is σ = 9919728. Its totient is φ = 1144512.

The previous prime is 4005917. The next prime is 4005943. The reversal of 4005918 is 8195004.

It is a junction number, because it is equal to n+sod(n) for n = 4005891 and 4005900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4005917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15771 + ... + 16022.

It is an arithmetic number, because the mean of its divisors is an integer number (413322).

Almost surely, 2^4005918 is an apocalyptic number.

4005918 is an abundant number, since it is smaller than the sum of its proper divisors (5913810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4005918 is a wasteful number, since it uses less digits than its factorization.

4005918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31808 (or 31805 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 4005918 is about 2001.4789531744. The cubic root of 4005918 is about 158.8183519494.

The spelling of 4005918 in words is "four million, five thousand, nine hundred eighteen".