13213240 has 16 divisors (see below), whose sum is σ = 29729880. Its totient is φ = 5285280.

The previous prime is 13213237. The next prime is 13213253. The reversal of 13213240 is 4231231.

It is a happy number.

13213240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×13213240² = 349179422595200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165126 + ... + 165205.

Almost surely, 2^13213240 is an apocalyptic number.

13213240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13213240 is an abundant number, since it is smaller than the sum of its proper divisors (16516640).

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

13213240 is a wasteful number, since it uses less digits than its factorization.

13213240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330342 (or 330338 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 13213240 is about 3635.0020632731. The cubic root of 13213240 is about 236.4121401266.

Adding to 13213240 its reverse (4231231), we get a palindrome (17444471).

Subtracting from 13213240 its reverse (4231231), we obtain a square (8982009 = 2997²).

The spelling of 13213240 in words is "thirteen million, two hundred thirteen thousand, two hundred forty".