13640258 has 4 divisors (see below), whose sum is σ = 20460390. Its totient is φ = 6820128.

The previous prime is 13640257. The next prime is 13640261. The reversal of 13640258 is 85204631.

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

It can be written as a sum of positive squares in only one way, i.e., 12159169 + 1481089 = 3487^2 + 1217^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13640258.

It is not an unprimeable number, because it can be changed into a prime (13640257) 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, 3410063 + ... + 3410066.

Almost surely, 2^13640258 is an apocalyptic number.

13640258 is a deficient number, since it is larger than the sum of its proper divisors (6820132).

13640258 is an equidigital number, since it uses as much as digits as its factorization.

13640258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6820131.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 13640258 is about 3693.2719910670. The cubic root of 13640258 is about 238.9319320873.

Adding to 13640258 its reverse (85204631), we get a palindrome (98844889).

The spelling of 13640258 in words is "thirteen million, six hundred forty thousand, two hundred fifty-eight".