18487723 has 2 divisors, whose sum is σ = 18487724. Its totient is φ = 18487722.

The previous prime is 18487691. The next prime is 18487727. The reversal of 18487723 is 32778481.

It is a strong prime.

It is an emirp because it is prime and its reverse (32778481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18487723 - 2⁵ = 18487691 is a prime.

It is not a weakly prime, because it can be changed into another prime (18487727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9243861 + 9243862.

It is an arithmetic number, because the mean of its divisors is an integer number (9243862).

Almost surely, 2^18487723 is an apocalyptic number.

18487723 is a deficient number, since it is larger than the sum of its proper divisors (1).

18487723 is an equidigital number, since it uses as much as digits as its factorization.

18487723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 40.

The square root of 18487723 is about 4299.7352244063. The cubic root of 18487723 is about 264.4201061106.

It can be divided in two parts, 184877 and 23, that added together give a square (184900 = 430²).

The spelling of 18487723 in words is "eighteen million, four hundred eighty-seven thousand, seven hundred twenty-three".