1379915993 has 4 divisors (see below), whose sum is σ = 1461087540. Its totient is φ = 1298744448.

The previous prime is 1379915951. The next prime is 1379916017. The reversal of 1379915993 is 3995199731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3995199731 = 53 ⋅75381127.

It can be written as a sum of positive squares in 2 ways, for example, as 1078268569 + 301647424 = 32837^2 + 17368^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379915993 - 2⁸ = 1379915737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1379915293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40585748 + ... + 40585781.

It is an arithmetic number, because the mean of its divisors is an integer number (365271885).

Almost surely, 2^1379915993 is an apocalyptic number.

It is an amenable number.

1379915993 is a deficient number, since it is larger than the sum of its proper divisors (81171547).

1379915993 is an equidigital number, since it uses as much as digits as its factorization.

1379915993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81171546.

The product of its digits is 2066715, while the sum is 56.

The square root of 1379915993 is about 37147.2205285941. The cubic root of 1379915993 is about 1113.3136897483.

It can be divided in two parts, 13799 and 15993, that added together give a palindrome (29792).

The spelling of 1379915993 in words is "one billion, three hundred seventy-nine million, nine hundred fifteen thousand, nine hundred ninety-three".