18099860 has 24 divisors (see below), whose sum is σ = 38938536. Its totient is φ = 7063040.

The previous prime is 18099853. The next prime is 18099869. The reversal of 18099860 is 6899081.

It can be written as a sum of positive squares in 4 ways, for example, as 2067844 + 16032016 = 1438^2 + 4004^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18099869) 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, 10217 + ... + 11856.

It is an arithmetic number, because the mean of its divisors is an integer number (1622439).

Almost surely, 2^18099860 is an apocalyptic number.

18099860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18099860 is an abundant number, since it is smaller than the sum of its proper divisors (20838676).

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

18099860 is a wasteful number, since it uses less digits than its factorization.

18099860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22123 (or 22121 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 18099860 is about 4254.3930236874. The cubic root of 18099860 is about 262.5578889713.

The spelling of 18099860 in words is "eighteen million, ninety-nine thousand, eight hundred sixty".