1373621 has 4 divisors (see below), whose sum is σ = 1376172. Its totient is φ = 1371072.

The previous prime is 1373611. The next prime is 1373627. The reversal of 1373621 is 1263731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1263731 = 7 ⋅180533.

It can be written as a sum of positive squares in 2 ways, for example, as 343396 + 1030225 = 586^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1373621 - 2⁶ = 1373557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1373627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (344043).

2^1373621 is an apocalyptic number.

It is an amenable number.

1373621 is a deficient number, since it is larger than the sum of its proper divisors (2551).

1373621 is an equidigital number, since it uses as much as digits as its factorization.

1373621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550.

The product of its digits is 756, while the sum is 23.

The square root of 1373621 is about 1172.0157848766. The cubic root of 1373621 is about 111.1618179299.

The spelling of 1373621 in words is "one million, three hundred seventy-three thousand, six hundred twenty-one".