18146140 has 72 divisors (see below), whose sum is σ = 43288560. Its totient is φ = 6349824.

The previous prime is 18146101. The next prime is 18146147. The reversal of 18146140 is 4164181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18146147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 342354 + ... + 342406.

It is an arithmetic number, because the mean of its divisors is an integer number (601230).

Almost surely, 2^18146140 is an apocalyptic number.

18146140 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 18146140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21644280).

18146140 is an abundant number, since it is smaller than the sum of its proper divisors (25142420).

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

18146140 is a wasteful number, since it uses less digits than its factorization.

18146140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18146140 is about 4259.8286350509. The cubic root of 18146140 is about 262.7814788634.

The spelling of 18146140 in words is "eighteen million, one hundred forty-six thousand, one hundred forty".