13400421 has 16 divisors (see below), whose sum is σ = 18777984. Its totient is φ = 8483904.

The previous prime is 13400417. The next prime is 13400441. The reversal of 13400421 is 12400431.

It is not a de Polignac number, because 13400421 - 2² = 13400417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13400421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13400441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10215 + ... + 11451.

It is an arithmetic number, because the mean of its divisors is an integer number (1173624).

Almost surely, 2^13400421 is an apocalyptic number.

It is an amenable number.

13400421 is a deficient number, since it is larger than the sum of its proper divisors (5377563).

13400421 is a wasteful number, since it uses less digits than its factorization.

13400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 13400421 is about 3660.6585473109. The cubic root of 13400421 is about 237.5232612489.

Adding to 13400421 its reverse (12400431), we get a palindrome (25800852).

The spelling of 13400421 in words is "thirteen million, four hundred thousand, four hundred twenty-one".