18978256 has 40 divisors (see below), whose sum is σ = 42479424. Its totient is φ = 8117760.

The previous prime is 18978251. The next prime is 18978257. The reversal of 18978256 is 65287981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18978251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180 + ... + 6163.

Almost surely, 2^18978256 is an apocalyptic number.

18978256 is a gapful number since it is divisible by the number (16) 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 18978256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21239712).

18978256 is an abundant number, since it is smaller than the sum of its proper divisors (23501168).

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

18978256 is a wasteful number, since it uses less digits than its factorization.

18978256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6379 (or 6373 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The square root of 18978256 is about 4356.4040216674. The cubic root of 18978256 is about 266.7383335155.

It can be divided in two parts, 1897 and 8256, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 18978256 in words is "eighteen million, nine hundred seventy-eight thousand, two hundred fifty-six".