13840406 has 4 divisors (see below), whose sum is σ = 20760612. Its totient is φ = 6920202.

The previous prime is 13840399. The next prime is 13840423. The reversal of 13840406 is 60404831.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460100 + ... + 3460103.

It is an arithmetic number, because the mean of its divisors is an integer number (5190153).

Almost surely, 2^13840406 is an apocalyptic number.

13840406 is a deficient number, since it is larger than the sum of its proper divisors (6920206).

13840406 is an equidigital number, since it uses as much as digits as its factorization.

13840406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6920205.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 13840406 is about 3720.2696138855. The cubic root of 13840406 is about 240.0949045960.

The spelling of 13840406 in words is "thirteen million, eight hundred forty thousand, four hundred six".