13821236 has 48 divisors (see below), whose sum is σ = 28891968. Its totient is φ = 5702400.

The previous prime is 13821233. The next prime is 13821251. The reversal of 13821236 is 63212831.

13821236 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (26).

Its product of digits (1728) is a multiple of the sum of its prime factors (432).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13821233) 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, 41591 + ... + 41921.

It is an arithmetic number, because the mean of its divisors is an integer number (601916).

Almost surely, 2^13821236 is an apocalyptic number.

It is an amenable number.

13821236 is an abundant number, since it is smaller than the sum of its proper divisors (15070732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13821236 is a wasteful number, since it uses less digits than its factorization.

13821236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 430 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 13821236 is about 3717.6922949593. The cubic root of 13821236 is about 239.9840035635.

The spelling of 13821236 in words is "thirteen million, eight hundred twenty-one thousand, two hundred thirty-six".