1379392121 has 4 divisors (see below), whose sum is σ = 1460532852. Its totient is φ = 1298251392.

The previous prime is 1379392117. The next prime is 1379392123. The reversal of 1379392121 is 1212939731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1212939731 = 26627 ⋅45553.

It can be written as a sum of positive squares in 2 ways, for example, as 1248632896 + 130759225 = 35336^2 + 11435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379392121 - 2² = 1379392117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1379392123) 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, 40570340 + ... + 40570373.

It is an arithmetic number, because the mean of its divisors is an integer number (365133213).

Almost surely, 2^1379392121 is an apocalyptic number.

It is an amenable number.

1379392121 is a deficient number, since it is larger than the sum of its proper divisors (81140731).

1379392121 is an equidigital number, since it uses as much as digits as its factorization.

1379392121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81140730.

The product of its digits is 20412, while the sum is 38.

The square root of 1379392121 is about 37140.1685645071. The cubic root of 1379392121 is about 1113.1727855932.

The spelling of 1379392121 in words is "one billion, three hundred seventy-nine million, three hundred ninety-two thousand, one hundred twenty-one".