13640406 has 16 divisors (see below), whose sum is σ = 29379504. Its totient is φ = 4197024.

The previous prime is 13640401. The next prime is 13640437. The reversal of 13640406 is 60404631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640401) 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, 87361 + ... + 87516.

It is an arithmetic number, because the mean of its divisors is an integer number (1836219).

Almost surely, 2^13640406 is an apocalyptic number.

13640406 is an abundant number, since it is smaller than the sum of its proper divisors (15739098).

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

13640406 is a wasteful number, since it uses less digits than its factorization.

13640406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174895.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 13640406 is about 3693.2920274465. The cubic root of 13640406 is about 238.9327962401.

The spelling of 13640406 in words is "thirteen million, six hundred forty thousand, four hundred six".