1379391 has 16 divisors (see below), whose sum is σ = 2004576. Its totient is φ = 838656.

The previous prime is 1379387. The next prime is 1379423. The reversal of 1379391 is 1939731.

It is not a de Polignac number, because 1379391 - 2² = 1379387 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4251 + ... + 4563.

It is an arithmetic number, because the mean of its divisors is an integer number (125286).

2^1379391 is an apocalyptic number.

1379391 is a deficient number, since it is larger than the sum of its proper divisors (625185).

1379391 is a wasteful number, since it uses less digits than its factorization.

1379391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442.

The product of its digits is 5103, while the sum is 33.

The square root of 1379391 is about 1174.4747762298. The cubic root of 1379391 is about 111.3172484043.

It can be divided in two parts, 1379 and 391, that added together give a triangular number (1770 = T₅₉).

The spelling of 1379391 in words is "one million, three hundred seventy-nine thousand, three hundred ninety-one".