18312697 has 4 divisors (see below), whose sum is σ = 19721380. Its totient is φ = 16904016.

The previous prime is 18312683. The next prime is 18312731. The reversal of 18312697 is 79621381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7096896 + 11215801 = 2664^2 + 3349^2 .

It is a cyclic number.

It is not a de Polignac number, because 18312697 - 2¹⁵ = 18279929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18312607) 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, 704322 + ... + 704347.

It is an arithmetic number, because the mean of its divisors is an integer number (4930345).

Almost surely, 2^18312697 is an apocalyptic number.

It is an amenable number.

18312697 is a deficient number, since it is larger than the sum of its proper divisors (1408683).

18312697 is a wasteful number, since it uses less digits than its factorization.

18312697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408682.

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

The square root of 18312697 is about 4279.3337098198. Note that the first 3 decimals coincide. The cubic root of 18312697 is about 263.5830242214.

It can be divided in two parts, 183 and 12697, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 18312697 in words is "eighteen million, three hundred twelve thousand, six hundred ninety-seven".