18197280 has 72 divisors (see below), whose sum is σ = 62103132. Its totient is φ = 4852224.

The previous prime is 18197261. The next prime is 18197281. The reversal of 18197280 is 8279181.

It can be written as a sum of positive squares in 2 ways, for example, as 16548624 + 1648656 = 4068^2 + 1284^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×18197280² = 662281998796800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18197281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4879 + ... + 7758.

Almost surely, 2^18197280 is an apocalyptic number.

18197280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18197280 is an abundant number, since it is smaller than the sum of its proper divisors (43905852).

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

18197280 is a wasteful number, since it uses less digits than its factorization.

18197280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12658 (or 12647 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 18197280 is about 4265.8270007116. The cubic root of 18197280 is about 263.0281068912.

It can be divided in two parts, 181 and 97280, that added together give a triangular number (97461 = T₄₄₁).

The spelling of 18197280 in words is "eighteen million, one hundred ninety-seven thousand, two hundred eighty".