13155640 has 16 divisors (see below), whose sum is σ = 29600280. Its totient is φ = 5262240.

The previous prime is 13155631. The next prime is 13155641. The reversal of 13155640 is 4655131.

13155640 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-4 number, since 4×13155640⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13155641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164406 + ... + 164485.

Almost surely, 2^13155640 is an apocalyptic number.

13155640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13155640 is an abundant number, since it is smaller than the sum of its proper divisors (16444640).

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

13155640 is a wasteful number, since it uses less digits than its factorization.

13155640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328902 (or 328898 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 13155640 is about 3627.0704432090. The cubic root of 13155640 is about 236.0681121031.

The spelling of 13155640 in words is "thirteen million, one hundred fifty-five thousand, six hundred forty".