1359821 has 4 divisors (see below), whose sum is σ = 1385532. Its totient is φ = 1334112.

The previous prime is 1359817. The next prime is 1359823. The reversal of 1359821 is 1289531.

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 697225 + 662596 = 835^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1359821 - 2² = 1359817 is a prime.

It is a super-2 number, since 2×1359821² = 3698226304082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1359823) 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, 12776 + ... + 12881.

It is an arithmetic number, because the mean of its divisors is an integer number (346383).

2^1359821 is an apocalyptic number.

It is an amenable number.

1359821 is a deficient number, since it is larger than the sum of its proper divisors (25711).

1359821 is an equidigital number, since it uses as much as digits as its factorization.

1359821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25710.

The product of its digits is 2160, while the sum is 29.

The square root of 1359821 is about 1166.1136308268. The cubic root of 1359821 is about 110.7883041433.

The spelling of 1359821 in words is "one million, three hundred fifty-nine thousand, eight hundred twenty-one".