18712693 has 6 divisors (see below), whose sum is σ = 18869186. Its totient is φ = 18557472.

The previous prime is 18712691. The next prime is 18712709. The reversal of 18712693 is 39621781.

It can be written as a sum of positive squares in 3 ways, for example, as 7436529 + 11276164 = 2727^2 + 3358^2 .

It is not a de Polignac number, because 18712693 - 2¹ = 18712691 is a prime.

It is a Duffinian number.

Its product of digits (18144) is a multiple of the sum of its prime divisors (1134).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18712691) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18271 + ... + 19267.

Almost surely, 2^18712693 is an apocalyptic number.

It is an amenable number.

18712693 is a deficient number, since it is larger than the sum of its proper divisors (156493).

18712693 is an frugal number, since it uses more digits than its factorization.

18712693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271 (or 1134 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 18712693 is about 4325.8170326541. The cubic root of 18712693 is about 265.4883270687.

It can be divided in two parts, 187 and 12693, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 18712693 in words is "eighteen million, seven hundred twelve thousand, six hundred ninety-three".