18897948 has 120 divisors (see below), whose sum is σ = 54153792. Its totient is φ = 5723136.

The previous prime is 18897947. The next prime is 18897959. The reversal of 18897948 is 84979881.

It is a super-2 number, since 2×18897948² = 714264877221408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 18897894 and 18897903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18897943) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 258840 + ... + 258912.

Almost surely, 2^18897948 is an apocalyptic number.

18897948 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 18897948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27076896).

18897948 is an abundant number, since it is smaller than the sum of its proper divisors (35255844).

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

18897948 is a wasteful number, since it uses less digits than its factorization.

18897948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 142 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 18897948 is about 4347.1770150294. The cubic root of 18897948 is about 266.3615600733.

The spelling of 18897948 in words is "eighteen million, eight hundred ninety-seven thousand, nine hundred forty-eight".