1339621 has 4 divisors (see below), whose sum is σ = 1361644. Its totient is φ = 1317600.

The previous prime is 1339619. The next prime is 1339627. The reversal of 1339621 is 1269331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 474721 + 864900 = 689^2 + 930^2 .

It is not a de Polignac number, because 1339621 - 2¹ = 1339619 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 (1339627) 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, 10920 + ... + 11041.

It is an arithmetic number, because the mean of its divisors is an integer number (340411).

2^1339621 is an apocalyptic number.

It is an amenable number.

1339621 is a deficient number, since it is larger than the sum of its proper divisors (22023).

1339621 is an equidigital number, since it uses as much as digits as its factorization.

1339621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22022.

The product of its digits is 972, while the sum is 25.

The square root of 1339621 is about 1157.4199756355. The cubic root of 1339621 is about 110.2369821958.

Subtracting from 1339621 its product of digits (972), we obtain a square (1338649 = 1157²).

The spelling of 1339621 in words is "one million, three hundred thirty-nine thousand, six hundred twenty-one".