1321623 has 16 divisors (see below), whose sum is σ = 2022400. Its totient is φ = 852120.

The previous prime is 1321601. The next prime is 1321627. The reversal of 1321623 is 3261231.

It is not a de Polignac number, because 1321623 - 2¹⁸ = 1059479 is a prime.

It is a Duffinian number.

1321623 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1321596 and 1321605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48 + ... + 1626.

It is an arithmetic number, because the mean of its divisors is an integer number (126400).

2^1321623 is an apocalyptic number.

1321623 is a deficient number, since it is larger than the sum of its proper divisors (700777).

1321623 is a wasteful number, since it uses less digits than its factorization.

1321623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619 (or 1613 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 1321623 is about 1149.6186324169. The cubic root of 1321623 is about 109.7410714280.

Adding to 1321623 its reverse (3261231), we get a palindrome (4582854).

The spelling of 1321623 in words is "one million, three hundred twenty-one thousand, six hundred twenty-three".