13421405 has 8 divisors (see below), whose sum is σ = 16272312. Its totient is φ = 10626048.

The previous prime is 13421399. The next prime is 13421407. The reversal of 13421405 is 50412431.

It can be written as a sum of positive squares in 4 ways, for example, as 33124 + 13388281 = 182^2 + 3659^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13421405 - 2¹² = 13417309 is a prime.

It is a super-2 number, since 2×13421405² = 360268224348050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13421407) 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, 13352 + ... + 14321.

It is an arithmetic number, because the mean of its divisors is an integer number (2034039).

Almost surely, 2^13421405 is an apocalyptic number.

It is an amenable number.

13421405 is a deficient number, since it is larger than the sum of its proper divisors (2850907).

13421405 is an equidigital number, since it uses as much as digits as its factorization.

13421405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27775.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 13421405 is about 3663.5235771044. The cubic root of 13421405 is about 237.6471774741.

Adding to 13421405 its reverse (50412431), we get a palindrome (63833836).

The spelling of 13421405 in words is "thirteen million, four hundred twenty-one thousand, four hundred five".