1353821 has 8 divisors (see below), whose sum is σ = 1579200. Its totient is φ = 1160124.

The previous prime is 1353809. The next prime is 1353827. The reversal of 1353821 is 1283531.

It is a de Polignac number, because none of the positive numbers 2^k-1353821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1353827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1631 + ... + 2316.

It is an arithmetic number, because the mean of its divisors is an integer number (197400).

2^1353821 is an apocalyptic number.

It is an amenable number.

1353821 is a deficient number, since it is larger than the sum of its proper divisors (225379).

1353821 is an frugal number, since it uses more digits than its factorization.

1353821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968 (or 3954 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 1353821 is about 1163.5381386100. The cubic root of 1353821 is about 110.6251184737.

The spelling of 1353821 in words is "one million, three hundred fifty-three thousand, eight hundred twenty-one".