18839700 has 162 divisors, whose sum is σ = 65283582. Its totient is φ = 4540800.

The previous prime is 18839677. The next prime is 18839707. The reversal of 18839700 is 793881.

It can be written as a sum of positive squares in 3 ways, for example, as 4186116 + 14653584 = 2046^2 + 3828^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18839707) 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 53 ways as a sum of consecutive naturals, for example, 108814 + ... + 108986.

Almost surely, 2^18839700 is an apocalyptic number.

18839700 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 18839700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32641791).

18839700 is an abundant number, since it is smaller than the sum of its proper divisors (46443882).

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

18839700 is a wasteful number, since it uses less digits than its factorization.

18839700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 18839700 is about 4340.4723245287. The cubic root of 18839700 is about 266.0876150600.

18839700 divided by its sum of digits (36) gives a palindrome (523325).

The spelling of 18839700 in words is "eighteen million, eight hundred thirty-nine thousand, seven hundred".