18229860 has 216 divisors, whose sum is σ = 65065728. Its totient is φ = 4276800.

The previous prime is 18229859. The next prime is 18229877. The reversal of 18229860 is 6892281.

18229860 = 138² + 139² + ... + 385².

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 588045 + ... + 588075.

Almost surely, 2^18229860 is an apocalyptic number.

18229860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18229860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32532864).

18229860 is an abundant number, since it is smaller than the sum of its proper divisors (46835868).

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

18229860 is a wasteful number, since it uses less digits than its factorization.

18229860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18229860 is about 4269.6440132639. The cubic root of 18229860 is about 263.1849865021.

The spelling of 18229860 in words is "eighteen million, two hundred twenty-nine thousand, eight hundred sixty".