13394821 has 12 divisors (see below), whose sum is σ = 15202432. Its totient is φ = 11781000.

The previous prime is 13394819. The next prime is 13394837. The reversal of 13394821 is 12849331.

It is not a de Polignac number, because 13394821 - 2¹ = 13394819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13394891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1966 + ... + 5536.

Almost surely, 2^13394821 is an apocalyptic number.

13394821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13394821 is a deficient number, since it is larger than the sum of its proper divisors (1807611).

13394821 is a wasteful number, since it uses less digits than its factorization.

13394821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624 (or 3613 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 13394821 is about 3659.8935776877. The cubic root of 13394821 is about 237.4901698609.

Subtracting from 13394821 its reverse (12849331), we obtain a triangular number (545490 = T₁₀₄₄).

The spelling of 13394821 in words is "thirteen million, three hundred ninety-four thousand, eight hundred twenty-one".