13640206 has 4 divisors (see below), whose sum is σ = 20460312. Its totient is φ = 6820102.

The previous prime is 13640201. The next prime is 13640213. The reversal of 13640206 is 60204631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60204631 = 83 ⋅725357.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410050 + ... + 3410053.

It is an arithmetic number, because the mean of its divisors is an integer number (5115078).

Almost surely, 2^13640206 is an apocalyptic number.

13640206 is a deficient number, since it is larger than the sum of its proper divisors (6820106).

13640206 is an equidigital number, since it uses as much as digits as its factorization.

13640206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6820105.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 13640206 is about 3693.2649512322. The cubic root of 13640206 is about 238.9316284646.

Adding to 13640206 its reverse (60204631), we get a palindrome (73844837).

The spelling of 13640206 in words is "thirteen million, six hundred forty thousand, two hundred six".