1390321 has 4 divisors (see below), whose sum is σ = 1408000. Its totient is φ = 1372644.

The previous prime is 1390309. The next prime is 1390331. The reversal of 1390321 is 1230931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1230931 = 13 ⋅94687.

It is a cyclic number.

It is not a de Polignac number, because 1390321 - 2⁹ = 1389809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390331) 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, 8721 + ... + 8878.

It is an arithmetic number, because the mean of its divisors is an integer number (352000).

2^1390321 is an apocalyptic number.

It is an amenable number.

1390321 is a deficient number, since it is larger than the sum of its proper divisors (17679).

1390321 is an equidigital number, since it uses as much as digits as its factorization.

1390321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17678.

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

The square root of 1390321 is about 1179.1187387197. The cubic root of 1390321 is about 111.6104932687.

It can be divided in two parts, 13903 and 21, that added together give a square (13924 = 118²).

The spelling of 1390321 in words is "one million, three hundred ninety thousand, three hundred twenty-one".