1379891 has 4 divisors (see below), whose sum is σ = 1393392. Its totient is φ = 1366392.

The previous prime is 1379887. The next prime is 1379897. The reversal of 1379891 is 1989731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1989731 = 17 ⋅117043.

It is a cyclic number.

It is not a de Polignac number, because 1379891 - 2² = 1379887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (1379897) 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, 6596 + ... + 6801.

It is an arithmetic number, because the mean of its divisors is an integer number (348348).

2^1379891 is an apocalyptic number.

1379891 is a deficient number, since it is larger than the sum of its proper divisors (13501).

1379891 is a wasteful number, since it uses less digits than its factorization.

1379891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13500.

The product of its digits is 13608, while the sum is 38.

The square root of 1379891 is about 1174.6876180500. The cubic root of 1379891 is about 111.3306968272.

The spelling of 1379891 in words is "one million, three hundred seventy-nine thousand, eight hundred ninety-one".