1379388397 has 4 divisors (see below), whose sum is σ = 1382665276. Its totient is φ = 1376111520.

The previous prime is 1379388389. The next prime is 1379388419. The reversal of 1379388397 is 7938839731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7938839731 = 173 ⋅45889247.

It can be written as a sum of positive squares in 2 ways, for example, as 217533001 + 1161855396 = 14749^2 + 34086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379388397 - 2³ = 1379388389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379388337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637808 + ... + 1638649.

It is an arithmetic number, because the mean of its divisors is an integer number (345666319).

Almost surely, 2^1379388397 is an apocalyptic number.

It is an amenable number.

1379388397 is a deficient number, since it is larger than the sum of its proper divisors (3276879).

1379388397 is an equidigital number, since it uses as much as digits as its factorization.

1379388397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276878.

The product of its digits is 6858432, while the sum is 58.

The square root of 1379388397 is about 37140.1184300750. The cubic root of 1379388397 is about 1113.1717838333.

The spelling of 1379388397 in words is "one billion, three hundred seventy-nine million, three hundred eighty-eight thousand, three hundred ninety-seven".