13155840 has 120 divisors (see below), whose sum is σ = 45642168. Its totient is φ = 3502080.

The previous prime is 13155827. The next prime is 13155851. The reversal of 13155840 is 4855131.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×13155840² = 346152252211200, 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 11 ways as a sum of consecutive naturals, for example, 22755 + ... + 23325.

Almost surely, 2^13155840 is an apocalyptic number.

13155840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13155840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22821084).

13155840 is an abundant number, since it is smaller than the sum of its proper divisors (32486328).

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

13155840 is an equidigital number, since it uses as much as digits as its factorization.

13155840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 13155840 is about 3627.0980135640. The cubic root of 13155840 is about 236.0693083805.

The spelling of 13155840 in words is "thirteen million, one hundred fifty-five thousand, eight hundred forty".