1397421 has 6 divisors (see below), whose sum is σ = 2018510. Its totient is φ = 931608.

The previous prime is 1397359. The next prime is 1397437. The reversal of 1397421 is 1247931.

It can be written as a sum of positive squares in only one way, i.e., 741321 + 656100 = 861^2 + 810^2 .

It is not a de Polignac number, because 1397421 - 2⁹ = 1396909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397441) 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 5 ways as a sum of consecutive naturals, for example, 77626 + ... + 77643.

2^1397421 is an apocalyptic number.

It is an amenable number.

1397421 is a deficient number, since it is larger than the sum of its proper divisors (621089).

1397421 is a wasteful number, since it uses less digits than its factorization.

1397421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155275 (or 155272 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1397421 is about 1182.1256278416. The cubic root of 1397421 is about 111.8001591561.

The spelling of 1397421 in words is "one million, three hundred ninety-seven thousand, four hundred twenty-one".