18139800 has 144 divisors (see below), whose sum is σ = 65520360. Its totient is φ = 4139520.

The previous prime is 18139789. The next prime is 18139811. The reversal of 18139800 is 893181.

It is an interprime number because it is at equal distance from previous prime (18139789) and next prime (18139811).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 29092 + ... + 29708.

Almost surely, 2^18139800 is an apocalyptic number.

18139800 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 18139800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32760180).

18139800 is an abundant number, since it is smaller than the sum of its proper divisors (47380560).

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

18139800 is a wasteful number, since it uses less digits than its factorization.

18139800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 634 counting only the distinct ones).

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

The square root of 18139800 is about 4259.0844086494. The cubic root of 18139800 is about 262.7508712770.

The spelling of 18139800 in words is "eighteen million, one hundred thirty-nine thousand, eight hundred".