1377391 has 4 divisors (see below), whose sum is σ = 1458432. Its totient is φ = 1296352.

The previous prime is 1377379. The next prime is 1377403. The reversal of 1377391 is 1937731.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1377379) and next prime (1377403).

It is not a de Polignac number, because 1377391 - 2⁵ = 1377359 is a prime.

It is a Duffinian number.

1377391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377371) 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, 40495 + ... + 40528.

It is an arithmetic number, because the mean of its divisors is an integer number (364608).

2^1377391 is an apocalyptic number.

1377391 is a deficient number, since it is larger than the sum of its proper divisors (81041).

1377391 is an equidigital number, since it uses as much as digits as its factorization.

1377391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81040.

The product of its digits is 3969, while the sum is 31.

The square root of 1377391 is about 1173.6230229507. The cubic root of 1377391 is about 111.2634221907.

The spelling of 1377391 in words is "one million, three hundred seventy-seven thousand, three hundred ninety-one".