13821420 has 24 divisors (see below), whose sum is σ = 38700144. Its totient is φ = 3685696.

The previous prime is 13821407. The next prime is 13821427. The reversal of 13821420 is 2412831.

It is not an unprimeable number, because it can be changed into a prime (13821427) 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, 115119 + ... + 115238.

It is an arithmetic number, because the mean of its divisors is an integer number (1612506).

Almost surely, 2^13821420 is an apocalyptic number.

13821420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13821420 is an abundant number, since it is smaller than the sum of its proper divisors (24878724).

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

13821420 is a wasteful number, since it uses less digits than its factorization.

13821420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230369 (or 230367 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 13821420 is about 3717.7170414113. The cubic root of 13821420 is about 239.9850685155.

It can be divided in two parts, 13821 and 420, that added together give a palindrome (14241).

The spelling of 13821420 in words is "thirteen million, eight hundred twenty-one thousand, four hundred twenty".