18158140 has 96 divisors (see below), whose sum is σ = 51254784. Its totient is φ = 5218560.

The previous prime is 18158137. The next prime is 18158191. The reversal of 18158140 is 4185181.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 18158099 and 18158108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19567 + ... + 20473.

It is an arithmetic number, because the mean of its divisors is an integer number (533904).

Almost surely, 2^18158140 is an apocalyptic number.

18158140 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 18158140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25627392).

18158140 is an abundant number, since it is smaller than the sum of its proper divisors (33096644).

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

18158140 is a wasteful number, since it uses less digits than its factorization.

18158140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947 (or 945 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 18158140 is about 4261.2369096308. The cubic root of 18158140 is about 262.8393916922.

The spelling of 18158140 in words is "eighteen million, one hundred fifty-eight thousand, one hundred forty".