18708426 has 48 divisors (see below), whose sum is σ = 46556640. Its totient is φ = 5369760.

The previous prime is 18708419. The next prime is 18708457. The reversal of 18708426 is 62480781.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1276 + ... + 6248.

It is an arithmetic number, because the mean of its divisors is an integer number (969930).

Almost surely, 2^18708426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18708426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23278320).

18708426 is an abundant number, since it is smaller than the sum of its proper divisors (27848214).

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

18708426 is a wasteful number, since it uses less digits than its factorization.

18708426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011 (or 5008 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18708426 is about 4325.3238029077. The cubic root of 18708426 is about 265.4681460289.

It can be divided in two parts, 1870 and 8426, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 18708426 in words is "eighteen million, seven hundred eight thousand, four hundred twenty-six".