18722448 has 80 divisors (see below), whose sum is σ = 56593600. Its totient is φ = 5909760.

The previous prime is 18722377. The next prime is 18722449. The reversal of 18722448 is 84422781.

It is a super-2 number, since 2×18722448² = 701060118225408, which contains 22 as substring.

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 (18722449) 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, 7068 + ... + 9348.

It is an arithmetic number, because the mean of its divisors is an integer number (707420).

Almost surely, 2^18722448 is an apocalyptic number.

18722448 is a gapful number since it is divisible by the number (18) 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 18722448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28296800).

18722448 is an abundant number, since it is smaller than the sum of its proper divisors (37871152).

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

18722448 is a wasteful number, since it uses less digits than its factorization.

18722448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317 (or 2305 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 18722448 is about 4326.9444184089. The cubic root of 18722448 is about 265.5344524221.

The spelling of 18722448 in words is "eighteen million, seven hundred twenty-two thousand, four hundred forty-eight".