18442947 has 8 divisors (see below), whose sum is σ = 24747856. Its totient is φ = 12216672.

The previous prime is 18442891. The next prime is 18442967. The reversal of 18442947 is 74924481.

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

It is not a de Polignac number, because 18442947 - 2⁶ = 18442883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18442967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19108 + ... + 20049.

It is an arithmetic number, because the mean of its divisors is an integer number (3093482).

Almost surely, 2^18442947 is an apocalyptic number.

18442947 is a deficient number, since it is larger than the sum of its proper divisors (6304909).

18442947 is a wasteful number, since it uses less digits than its factorization.

18442947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39317.

The product of its digits is 64512, while the sum is 39.

The square root of 18442947 is about 4294.5252356925. The cubic root of 18442947 is about 264.2064644082.

The spelling of 18442947 in words is "eighteen million, four hundred forty-two thousand, nine hundred forty-seven".