1868881 has 4 divisors (see below), whose sum is σ = 2135872. Its totient is φ = 1601892.

The previous prime is 1868879. The next prime is 1868917. The reversal of 1868881 is 1888681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1888681 = 163 ⋅11587.

It is a cyclic number.

It is not a de Polignac number, because 1868881 - 2¹ = 1868879 is a prime.

It is a super-2 number, since 2×1868881² = 6985432384322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1868851) 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, 133485 + ... + 133498.

It is an arithmetic number, because the mean of its divisors is an integer number (533968).

2^1868881 is an apocalyptic number.

It is an amenable number.

1868881 is a deficient number, since it is larger than the sum of its proper divisors (266991).

1868881 is an equidigital number, since it uses as much as digits as its factorization.

1868881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266990.

The product of its digits is 24576, while the sum is 40.

The square root of 1868881 is about 1367.0702249702. The cubic root of 1868881 is about 123.1763175159.

It can be divided in two parts, 18688 and 81, that added together give a square (18769 = 137²).

The spelling of 1868881 in words is "one million, eight hundred sixty-eight thousand, eight hundred eighty-one".