18212797 has 4 divisors (see below), whose sum is σ = 19284156. Its totient is φ = 17141440.

The previous prime is 18212749. The next prime is 18212807. The reversal of 18212797 is 79721281.

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 15319396 + 2893401 = 3914^2 + 1701^2 .

It is not a de Polignac number, because 18212797 - 2¹¹ = 18210749 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 (18218797) 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, 535654 + ... + 535687.

It is an arithmetic number, because the mean of its divisors is an integer number (4821039).

Almost surely, 2^18212797 is an apocalyptic number.

18212797 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18212797 is a deficient number, since it is larger than the sum of its proper divisors (1071359).

18212797 is a wasteful number, since it uses less digits than its factorization.

18212797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071358.

The product of its digits is 14112, while the sum is 37.

The square root of 18212797 is about 4267.6453695217. The cubic root of 18212797 is about 263.1028478708.

The spelling of 18212797 in words is "eighteen million, two hundred twelve thousand, seven hundred ninety-seven".