18942426 has 48 divisors (see below), whose sum is σ = 42981120. Its totient is φ = 6022080.

The previous prime is 18942419. The next prime is 18942439. The reversal of 18942426 is 62424981.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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, 46110 + ... + 46518.

It is an arithmetic number, because the mean of its divisors is an integer number (895440).

Almost surely, 2^18942426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18942426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21490560).

18942426 is an abundant number, since it is smaller than the sum of its proper divisors (24038694).

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

18942426 is a wasteful number, since it uses less digits than its factorization.

18942426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 528 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 18942426 is about 4352.2897421932. The cubic root of 18942426 is about 266.5703648793.

The spelling of 18942426 in words is "eighteen million, nine hundred forty-two thousand, four hundred twenty-six".