13640212 has 6 divisors (see below), whose sum is σ = 23870378. Its totient is φ = 6820104.

The previous prime is 13640201. The next prime is 13640213. The reversal of 13640212 is 21204631.

It can be written as a sum of positive squares in only one way, i.e., 7420176 + 6220036 = 2724^2 + 2494^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13640212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1705023 + ... + 1705030.

Almost surely, 2^13640212 is an apocalyptic number.

It is an amenable number.

13640212 is a deficient number, since it is larger than the sum of its proper divisors (10230166).

13640212 is a wasteful number, since it uses less digits than its factorization.

13640212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410057 (or 3410055 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 13640212 is about 3693.2657635215. The cubic root of 13640212 is about 238.9316634981.

Adding to 13640212 its reverse (21204631), we get a palindrome (34844843).

The spelling of 13640212 in words is "thirteen million, six hundred forty thousand, two hundred twelve".