4013881 has 2 divisors, whose sum is σ = 4013882. Its totient is φ = 4013880.

The previous prime is 4013857. The next prime is 4013897. The reversal of 4013881 is 1883104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3980025 + 33856 = 1995^2 + 184^2 .

It is a cyclic number.

It is not a de Polignac number, because 4013881 - 2⁹ = 4013369 is a prime.

It is a super-2 number, since 2×4013881² = 32222481364322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4013851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2006940 + 2006941.

It is an arithmetic number, because the mean of its divisors is an integer number (2006941).

Almost surely, 2^4013881 is an apocalyptic number.

It is an amenable number.

4013881 is a deficient number, since it is larger than the sum of its proper divisors (1).

4013881 is an equidigital number, since it uses as much as digits as its factorization.

4013881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 4013881 is about 2003.4672445538. The cubic root of 4013881 is about 158.9235158166.

Adding to 4013881 its reverse (1883104), we get a palindrome (5896985).

The spelling of 4013881 in words is "four million, thirteen thousand, eight hundred eighty-one".