1397321 has 8 divisors (see below), whose sum is σ = 1446984. Its totient is φ = 1348480.

The previous prime is 1397311. The next prime is 1397329. The reversal of 1397321 is 1237931.

It can be written as a sum of positive squares in 4 ways, for example, as 541696 + 855625 = 736^2 + 925^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1397321 - 2⁶ = 1397257 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6995 + ... + 7191.

It is an arithmetic number, because the mean of its divisors is an integer number (180873).

2^1397321 is an apocalyptic number.

It is an amenable number.

1397321 is a deficient number, since it is larger than the sum of its proper divisors (49663).

1397321 is a wasteful number, since it uses less digits than its factorization.

1397321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411.

The product of its digits is 1134, while the sum is 26.

The square root of 1397321 is about 1182.0833303960. The cubic root of 1397321 is about 111.7974922713.

The spelling of 1397321 in words is "one million, three hundred ninety-seven thousand, three hundred twenty-one".