4001918 has 4 divisors (see below), whose sum is σ = 6002880. Its totient is φ = 2000958.

The previous prime is 4001891. The next prime is 4001939. The reversal of 4001918 is 8191004.

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

It is a junction number, because it is equal to n+sod(n) for n = 4001893 and 4001902.

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, 1000478 + ... + 1000481.

It is an arithmetic number, because the mean of its divisors is an integer number (1500720).

Almost surely, 2^4001918 is an apocalyptic number.

4001918 is a deficient number, since it is larger than the sum of its proper divisors (2000962).

4001918 is a wasteful number, since it uses less digits than its factorization.

4001918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000961.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 4001918 is about 2000.4794425337. The cubic root of 4001918 is about 158.7654731028.

The spelling of 4001918 in words is "four million, one thousand, nine hundred eighteen".