18970872 has 64 divisors (see below), whose sum is σ = 49744800. Its totient is φ = 6021120.

The previous prime is 18970867. The next prime is 18970877. The reversal of 18970872 is 27807981.

It is an interprime number because it is at equal distance from previous prime (18970867) and next prime (18970877).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18970877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67372 + ... + 67652.

Almost surely, 2^18970872 is an apocalyptic number.

18970872 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 18970872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24872400).

18970872 is an abundant number, since it is smaller than the sum of its proper divisors (30773928).

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

18970872 is a wasteful number, since it uses less digits than its factorization.

18970872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 18970872 is about 4355.5564512471. The cubic root of 18970872 is about 266.7037351248.

The spelling of 18970872 in words is "eighteen million, nine hundred seventy thousand, eight hundred seventy-two".