18529947 has 12 divisors (see below), whose sum is σ = 27388504. Its totient is φ = 12065760.

The previous prime is 18529943. The next prime is 18529961. The reversal of 18529947 is 74992581.

It is not a de Polignac number, because 18529947 - 2² = 18529943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18529943) 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, 23554 + ... + 24327.

Almost surely, 2^18529947 is an apocalyptic number.

18529947 is a deficient number, since it is larger than the sum of its proper divisors (8858557).

18529947 is a wasteful number, since it uses less digits than its factorization.

18529947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47930 (or 47927 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 18529947 is about 4304.6424938664. The cubic root of 18529947 is about 264.6212555533.

The spelling of 18529947 in words is "eighteen million, five hundred twenty-nine thousand, nine hundred forty-seven".