18138350 has 48 divisors (see below), whose sum is σ = 36210480. Its totient is φ = 6739200.

The previous prime is 18138343. The next prime is 18138361. The reversal of 18138350 is 5383181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57794 + ... + 58106.

It is an arithmetic number, because the mean of its divisors is an integer number (754385).

Almost surely, 2^18138350 is an apocalyptic number.

18138350 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18138350 is a deficient number, since it is larger than the sum of its proper divisors (18072130).

18138350 is a wasteful number, since it uses less digits than its factorization.

18138350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18138350 is about 4258.9141808682. The cubic root of 18138350 is about 262.7438701172.

The spelling of 18138350 in words is "eighteen million, one hundred thirty-eight thousand, three hundred fifty".