1327638394 has 4 divisors (see below), whose sum is σ = 1991457594. Its totient is φ = 663819196.

The previous prime is 1327638391. The next prime is 1327638397. The reversal of 1327638394 is 4938367231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4938367231 = 7 ⋅705481033.

It is an interprime number because it is at equal distance from previous prime (1327638391) and next prime (1327638397).

It can be written as a sum of positive squares in only one way, i.e., 1074987369 + 252651025 = 32787^2 + 15895^2 .

It is not an unprimeable number, because it can be changed into a prime (1327638391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331909597 + ... + 331909600.

Almost surely, 2^1327638394 is an apocalyptic number.

1327638394 is a deficient number, since it is larger than the sum of its proper divisors (663819200).

1327638394 is an equidigital number, since it uses as much as digits as its factorization.

1327638394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663819199.

The product of its digits is 653184, while the sum is 46.

The square root of 1327638394 is about 36436.7725519152. The cubic root of 1327638394 is about 1099.0731570168.

The spelling of 1327638394 in words is "one billion, three hundred twenty-seven million, six hundred thirty-eight thousand, three hundred ninety-four".