1938409794 has 12 divisors (see below), whose sum is σ = 4199887926. Its totient is φ = 646136592.

The previous prime is 1938409789. The next prime is 1938409831. The reversal of 1938409794 is 4979048391.

It can be written as a sum of positive squares in only one way, i.e., 1937144169 + 1265625 = 44013^2 + 1125^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1938409794.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53844699 + ... + 53844734.

Almost surely, 2^1938409794 is an apocalyptic number.

1938409794 is an abundant number, since it is smaller than the sum of its proper divisors (2261478132).

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

1938409794 is a wasteful number, since it uses less digits than its factorization.

1938409794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107689441 (or 107689438 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 1938409794 is about 44027.3755066095. The cubic root of 1938409794 is about 1246.8528390054.

The spelling of 1938409794 in words is "one billion, nine hundred thirty-eight million, four hundred nine thousand, seven hundred ninety-four".