1379722891 has 4 divisors (see below), whose sum is σ = 1382909752. Its totient is φ = 1376536032.

The previous prime is 1379722889. The next prime is 1379722901. The reversal of 1379722891 is 1982279731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1982279731 = 15737 ⋅125963.

It is a cyclic number.

It is not a de Polignac number, because 1379722891 - 2¹ = 1379722889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1379722691) 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, 1592781 + ... + 1593646.

It is an arithmetic number, because the mean of its divisors is an integer number (345727438).

Almost surely, 2^1379722891 is an apocalyptic number.

1379722891 is a deficient number, since it is larger than the sum of its proper divisors (3186861).

1379722891 is an equidigital number, since it uses as much as digits as its factorization.

1379722891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3186860.

The product of its digits is 381024, while the sum is 49.

The square root of 1379722891 is about 37144.6212929948. The cubic root of 1379722891 is about 1113.2617558793.

The spelling of 1379722891 in words is "one billion, three hundred seventy-nine million, seven hundred twenty-two thousand, eight hundred ninety-one".