818972 has 24 divisors (see below), whose sum is σ = 1787520. Its totient is φ = 318960.

The previous prime is 818969. The next prime is 818977. The reversal of 818972 is 279818.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 2.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 818972.

It is not an unprimeable number, because it can be changed into a prime (818977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1022 + ... + 1637.

It is an arithmetic number, because the mean of its divisors is an integer number (74480).

2⁸¹⁸⁹⁷² is an apocalyptic number.

It is an amenable number.

818972 is an abundant number, since it is smaller than the sum of its proper divisors (968548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

818972 is a wasteful number, since it uses less digits than its factorization.

818972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681 (or 2679 counting only the distinct ones).

The product of its digits is 8064, while the sum is 35.

The square root of 818972 is about 904.9707177583. The cubic root of 818972 is about 93.5598861397.

The spelling of 818972 in words is "eight hundred eighteen thousand, nine hundred seventy-two".