18742823 has 16 divisors (see below), whose sum is σ = 21962016. Its totient is φ = 15805440.

The previous prime is 18742819. The next prime is 18742847. The reversal of 18742823 is 32824781.

It is a cyclic number.

It is not a de Polignac number, because 18742823 - 2² = 18742819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18742123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12965 + ... + 14337.

It is an arithmetic number, because the mean of its divisors is an integer number (1372626).

Almost surely, 2^18742823 is an apocalyptic number.

18742823 is a deficient number, since it is larger than the sum of its proper divisors (3219193).

18742823 is a wasteful number, since it uses less digits than its factorization.

18742823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474.

The product of its digits is 21504, while the sum is 35.

The square root of 18742823 is about 4329.2982110268. The cubic root of 18742823 is about 265.6307415230.

The spelling of 18742823 in words is "eighteen million, seven hundred forty-two thousand, eight hundred twenty-three".