18190380 has 48 divisors (see below), whose sum is σ = 54853344. Its totient is φ = 4477440.

The previous prime is 18190379. The next prime is 18190387. The reversal of 18190380 is 8309181.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (18190387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10881 + ... + 12440.

It is an arithmetic number, because the mean of its divisors is an integer number (1142778).

Almost surely, 2^18190380 is an apocalyptic number.

18190380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18190380 is an abundant number, since it is smaller than the sum of its proper divisors (36662964).

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

18190380 is a wasteful number, since it uses less digits than its factorization.

18190380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23346 (or 23344 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 18190380 is about 4265.0181711219. The cubic root of 18190380 is about 262.9948579043.

The spelling of 18190380 in words is "eighteen million, one hundred ninety thousand, three hundred eighty".