1391320 has 32 divisors (see below), whose sum is σ = 3578400. Its totient is φ = 476928.

The previous prime is 1391317. The next prime is 1391323. The reversal of 1391320 is 231931.

It is an interprime number because it is at equal distance from previous prime (1391317) and next prime (1391323).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391323) 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 7 ways as a sum of consecutive naturals, for example, 2205 + ... + 2764.

It is an arithmetic number, because the mean of its divisors is an integer number (111825).

2^1391320 is an apocalyptic number.

1391320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1391320 is an abundant number, since it is smaller than the sum of its proper divisors (2187080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391320 is a wasteful number, since it uses less digits than its factorization.

1391320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4987 (or 4983 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 1391320 is about 1179.5422841085. The cubic root of 1391320 is about 111.6372190364.

It can be divided in two parts, 1391 and 320, that added together give a triangular number (1711 = T₅₈).

The spelling of 1391320 in words is "one million, three hundred ninety-one thousand, three hundred twenty".