13860840 has 128 divisors (see below), whose sum is σ = 49248000. Its totient is φ = 3053568.

The previous prime is 13860827. The next prime is 13860841. The reversal of 13860840 is 4806831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 13860798 and 13860807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13860841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24076 + ... + 24644.

It is an arithmetic number, because the mean of its divisors is an integer number (384750).

Almost surely, 2^13860840 is an apocalyptic number.

13860840 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 13860840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24624000).

13860840 is an abundant number, since it is smaller than the sum of its proper divisors (35387160).

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

13860840 is a wasteful number, since it uses less digits than its factorization.

13860840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 13860840 is about 3723.0149073030. The cubic root of 13860840 is about 240.2130053415.

The spelling of 13860840 in words is "thirteen million, eight hundred sixty thousand, eight hundred forty".