18366890 has 8 divisors (see below), whose sum is σ = 33060420. Its totient is φ = 7346752.

The previous prime is 18366869. The next prime is 18366899. The reversal of 18366890 is 9866381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18344089 + 22801 = 4283^2 + 151^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18366899) 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, 918335 + ... + 918354.

Almost surely, 2^18366890 is an apocalyptic number.

18366890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18366890 is a deficient number, since it is larger than the sum of its proper divisors (14693530).

18366890 is a wasteful number, since it uses less digits than its factorization.

18366890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836696.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18366890 is about 4285.6609758589. The cubic root of 18366890 is about 263.8427763727.

The spelling of 18366890 in words is "eighteen million, three hundred sixty-six thousand, eight hundred ninety".