1894426638 has 16 divisors (see below), whose sum is σ = 4080303696. Its totient is φ = 582900480.

The previous prime is 1894426627. The next prime is 1894426657. The reversal of 1894426638 is 8366244981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12143683 + ... + 12143838.

It is an arithmetic number, because the mean of its divisors is an integer number (255018981).

Almost surely, 2^1894426638 is an apocalyptic number.

1894426638 is an abundant number, since it is smaller than the sum of its proper divisors (2185877058).

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

1894426638 is a wasteful number, since it uses less digits than its factorization.

1894426638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24287539.

The product of its digits is 1990656, while the sum is 51.

The square root of 1894426638 is about 43525.0116369887. The cubic root of 1894426638 is about 1237.3500986064.

The spelling of 1894426638 in words is "one billion, eight hundred ninety-four million, four hundred twenty-six thousand, six hundred thirty-eight".