18879744 has 144 divisors (see below), whose sum is σ = 56774144. Its totient is φ = 5529600.

The previous prime is 18879743. The next prime is 18879793. The reversal of 18879744 is 44797881.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 18879693 and 18879702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18879743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309474 + ... + 309534.

Almost surely, 2^18879744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18879744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28387072).

18879744 is an abundant number, since it is smaller than the sum of its proper divisors (37894400).

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

18879744 is a wasteful number, since it uses less digits than its factorization.

18879744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 110 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 18879744 is about 4345.0827379925. The cubic root of 18879744 is about 266.2760057474.

The spelling of 18879744 in words is "eighteen million, eight hundred seventy-nine thousand, seven hundred forty-four".