18652540 has 72 divisors (see below), whose sum is σ = 42921648. Its totient is φ = 6800640.

The previous prime is 18652537. The next prime is 18652541. The reversal of 18652540 is 4525681.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18652541) 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, 433759 + ... + 433801.

It is an arithmetic number, because the mean of its divisors is an integer number (596134).

Almost surely, 2^18652540 is an apocalyptic number.

18652540 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 18652540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21460824).

18652540 is an abundant number, since it is smaller than the sum of its proper divisors (24269108).

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

18652540 is a wasteful number, since it uses less digits than its factorization.

18652540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 18652540 is about 4318.8586455220. The cubic root of 18652540 is about 265.2035460019.

The spelling of 18652540 in words is "eighteen million, six hundred fifty-two thousand, five hundred forty".