16039918 has 4 divisors (see below), whose sum is σ = 24059880. Its totient is φ = 8019958.

The previous prime is 16039913. The next prime is 16039921. The reversal of 16039918 is 81993061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81993061 = 149 ⋅550289.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16039913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4009978 + ... + 4009981.

It is an arithmetic number, because the mean of its divisors is an integer number (6014970).

Almost surely, 2^16039918 is an apocalyptic number.

16039918 is a deficient number, since it is larger than the sum of its proper divisors (8019962).

16039918 is an equidigital number, since it uses as much as digits as its factorization.

16039918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8019961.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 16039918 is about 4004.9866416756. The cubic root of 16039918 is about 252.1935923164.

The spelling of 16039918 in words is "sixteen million, thirty-nine thousand, nine hundred eighteen".