18331047 has 36 divisors (see below), whose sum is σ = 31104216. Its totient is φ = 10372320.

The previous prime is 18331043. The next prime is 18331091. The reversal of 18331047 is 74013381.

It is not a de Polignac number, because 18331047 - 2² = 18331043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18331047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18331043) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 86772 + ... + 86982.

It is an arithmetic number, because the mean of its divisors is an integer number (864006).

Almost surely, 2^18331047 is an apocalyptic number.

18331047 is a deficient number, since it is larger than the sum of its proper divisors (12773169).

18331047 is a wasteful number, since it uses less digits than its factorization.

18331047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 18331047 is about 4281.4771983511. The cubic root of 18331047 is about 263.6710348125.

The spelling of 18331047 in words is "eighteen million, three hundred thirty-one thousand, forty-seven".