4187881 has 4 divisors (see below), whose sum is σ = 4196164. Its totient is φ = 4179600.

The previous prime is 4187851. The next prime is 4187891. The reversal of 4187881 is 1887814.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1243225 + 2944656 = 1115^2 + 1716^2 .

It is a cyclic number.

It is not a de Polignac number, because 4187881 - 2⁷ = 4187753 is a prime.

It is a super-2 number, since 2×4187881² = 35076694540322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4187881.

It is not an unprimeable number, because it can be changed into a prime (4187801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3330 + ... + 4411.

It is an arithmetic number, because the mean of its divisors is an integer number (1049041).

Almost surely, 2^4187881 is an apocalyptic number.

It is an amenable number.

4187881 is a deficient number, since it is larger than the sum of its proper divisors (8283).

4187881 is an equidigital number, since it uses as much as digits as its factorization.

4187881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8282.

The product of its digits is 14336, while the sum is 37.

The square root of 4187881 is about 2046.4312839673. The cubic root of 4187881 is about 161.1875314384.

The spelling of 4187881 in words is "four million, one hundred eighty-seven thousand, eight hundred eighty-one".