1399188794 has 4 divisors (see below), whose sum is σ = 2098783194. Its totient is φ = 699594396.

The previous prime is 1399188787. The next prime is 1399188797. The reversal of 1399188794 is 4978819931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4978819931 = 167 ⋅29813293.

It can be written as a sum of positive squares in only one way, i.e., 1231097569 + 168091225 = 35087^2 + 12965^2 .

It is not an unprimeable number, because it can be changed into a prime (1399188797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349797197 + ... + 349797200.

Almost surely, 2^1399188794 is an apocalyptic number.

1399188794 is a deficient number, since it is larger than the sum of its proper divisors (699594400).

1399188794 is an equidigital number, since it uses as much as digits as its factorization.

1399188794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699594399.

The product of its digits is 3919104, while the sum is 59.

The square root of 1399188794 is about 37405.7321008425. The cubic root of 1399188794 is about 1118.4728319589.

The spelling of 1399188794 in words is "one billion, three hundred ninety-nine million, one hundred eighty-eight thousand, seven hundred ninety-four".