13881646 has 4 divisors (see below), whose sum is σ = 20822472. Its totient is φ = 6940822.

The previous prime is 13881641. The next prime is 13881649. The reversal of 13881646 is 64618831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64618831 = 461 ⋅140171.

It is a super-3 number, since 3×13881646³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13881641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3470410 + ... + 3470413.

It is an arithmetic number, because the mean of its divisors is an integer number (5205618).

Almost surely, 2^13881646 is an apocalyptic number.

13881646 is a deficient number, since it is larger than the sum of its proper divisors (6940826).

13881646 is an equidigital number, since it uses as much as digits as its factorization.

13881646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6940825.

The product of its digits is 27648, while the sum is 37.

The square root of 13881646 is about 3725.8081002650. The cubic root of 13881646 is about 240.3331369056. Note that the first 3 decimals are identical.

The spelling of 13881646 in words is "thirteen million, eight hundred eighty-one thousand, six hundred forty-six".