13861640 has 128 divisors (see below), whose sum is σ = 37497600. Its totient is φ = 4561920.

The previous prime is 13861633. The next prime is 13861651. The reversal of 13861640 is 4616831.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227210 + ... + 227270.

It is an arithmetic number, because the mean of its divisors is an integer number (292950).

Almost surely, 2^13861640 is an apocalyptic number.

13861640 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 13861640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18748800).

13861640 is an abundant number, since it is smaller than the sum of its proper divisors (23635960).

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

13861640 is a wasteful number, since it uses less digits than its factorization.

13861640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 13861640 is about 3723.1223455589. The cubic root of 13861640 is about 240.2176266754.

The spelling of 13861640 in words is "thirteen million, eight hundred sixty-one thousand, six hundred forty".