18873972 has 60 divisors (see below), whose sum is σ = 53147556. Its totient is φ = 5806080.

The previous prime is 18873919. The next prime is 18873977. The reversal of 18873972 is 27937881.

It can be written as a sum of positive squares in 2 ways, for example, as 8608356 + 10265616 = 2934^2 + 3204^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18873977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1972 + ... + 6452.

Almost surely, 2^18873972 is an apocalyptic number.

18873972 is a gapful number since it is divisible by the number (12) 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 18873972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26573778).

18873972 is an abundant number, since it is smaller than the sum of its proper divisors (34273584).

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

18873972 is a wasteful number, since it uses less digits than its factorization.

18873972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510 (or 4499 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 18873972 is about 4344.4184881293. The cubic root of 18873972 is about 266.2488672834.

The spelling of 18873972 in words is "eighteen million, eight hundred seventy-three thousand, nine hundred seventy-two".