18283780 has 12 divisors (see below), whose sum is σ = 38395980. Its totient is φ = 7313504.

The previous prime is 18283763. The next prime is 18283787. The reversal of 18283780 is 8738281.

It can be written as a sum of positive squares in 2 ways, for example, as 10342656 + 7941124 = 3216^2 + 2818^2 .

It is a super-2 number, since 2×18283780² = 668593222176800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18283787) 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, 457075 + ... + 457114.

It is an arithmetic number, because the mean of its divisors is an integer number (3199665).

Almost surely, 2^18283780 is an apocalyptic number.

18283780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18283780 is an abundant number, since it is smaller than the sum of its proper divisors (20112200).

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

18283780 is a wasteful number, since it uses less digits than its factorization.

18283780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914198 (or 914196 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 18283780 is about 4275.9536947914. The cubic root of 18283780 is about 263.4442125955. Note that the first 3 decimals are identical.

The spelling of 18283780 in words is "eighteen million, two hundred eighty-three thousand, seven hundred eighty".