40881 has 4 divisors (see below), whose sum is σ = 54512. Its totient is φ = 27252.

The previous prime is 40879. The next prime is 40883. The reversal of 40881 is 18804.

Added to its reverse (18804) it gives a triangular number (59685 = T₃₄₅).

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.

It is an interprime number because it is at equal distance from previous prime (40879) and next prime (40883).

It is not a de Polignac number, because 40881 - 2¹ = 40879 is a prime.

It is a super-2 number, since 2×40881² = 3342512322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40883) 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, 6811 + ... + 6816.

It is an arithmetic number, because the mean of its divisors is an integer number (13628).

2⁴⁰⁸⁸¹ is an apocalyptic number.

It is an amenable number.

40881 is a deficient number, since it is larger than the sum of its proper divisors (13631).

40881 is a wasteful number, since it uses less digits than its factorization.

40881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13630.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 40881 is about 202.1905042281. The cubic root of 40881 is about 34.4487792748.

Adding to 40881 its reverse (18804), we get a triangular number (59685 = T₃₄₅).

The spelling of 40881 in words is "forty thousand, eight hundred eighty-one".