18529940 has 144 divisors (see below), whose sum is σ = 50050560. Its totient is φ = 5702400.

The previous prime is 18529937. The next prime is 18529943. The reversal of 18529940 is 4992581.

It is an interprime number because it is at equal distance from previous prime (18529937) and next prime (18529943).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 18529894 and 18529903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18529943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 597725 + ... + 597755.

Almost surely, 2^18529940 is an apocalyptic number.

18529940 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 18529940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25025280).

18529940 is an abundant number, since it is smaller than the sum of its proper divisors (31520620).

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

18529940 is a wasteful number, since it uses less digits than its factorization.

18529940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 18529940 is about 4304.6416807906. The cubic root of 18529940 is about 264.6212222315.

The spelling of 18529940 in words is "eighteen million, five hundred twenty-nine thousand, nine hundred forty".