13453821 has 6 divisors (see below), whose sum is σ = 19433310. Its totient is φ = 8969208.

The previous prime is 13453807. The next prime is 13453823. The reversal of 13453821 is 12835431.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 1028196 = 3525^2 + 1014^2 .

It is not a de Polignac number, because 13453821 - 2¹¹ = 13451773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13453823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 747426 + ... + 747443.

It is an arithmetic number, because the mean of its divisors is an integer number (3238885).

Almost surely, 2^13453821 is an apocalyptic number.

It is an amenable number.

13453821 is a deficient number, since it is larger than the sum of its proper divisors (5979489).

13453821 is a wasteful number, since it uses less digits than its factorization.

13453821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494875 (or 1494872 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 13453821 is about 3667.9450650194. The cubic root of 13453821 is about 237.8383491437.

The spelling of 13453821 in words is "thirteen million, four hundred fifty-three thousand, eight hundred twenty-one".