18434140 has 48 divisors (see below), whose sum is σ = 41176800. Its totient is φ = 6918912.

The previous prime is 18434113. The next prime is 18434153. The reversal of 18434140 is 4143481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21031 + ... + 21889.

It is an arithmetic number, because the mean of its divisors is an integer number (857850).

Almost surely, 2^18434140 is an apocalyptic number.

18434140 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 18434140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20588400).

18434140 is an abundant number, since it is smaller than the sum of its proper divisors (22742660).

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

18434140 is a wasteful number, since it uses less digits than its factorization.

18434140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 18434140 is about 4293.4997379760. The cubic root of 18434140 is about 264.1644024967.

The spelling of 18434140 in words is "eighteen million, four hundred thirty-four thousand, one hundred forty".