18900723 has 4 divisors (see below), whose sum is σ = 25200968. Its totient is φ = 12600480.

The previous prime is 18900703. The next prime is 18900737. The reversal of 18900723 is 32700981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18900723 - 2⁵ = 18900691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18900703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3150118 + ... + 3150123.

It is an arithmetic number, because the mean of its divisors is an integer number (6300242).

Almost surely, 2^18900723 is an apocalyptic number.

18900723 is a deficient number, since it is larger than the sum of its proper divisors (6300245).

18900723 is an equidigital number, since it uses as much as digits as its factorization.

18900723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6300244.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 18900723 is about 4347.4961759615. The cubic root of 18900723 is about 266.3745970646.

The spelling of 18900723 in words is "eighteen million, nine hundred thousand, seven hundred twenty-three".