40842181 has 4 divisors (see below), whose sum is σ = 42617952. Its totient is φ = 39066412.

The previous prime is 40842173. The next prime is 40842187. The reversal of 40842181 is 18124804.

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 a cyclic number.

It is not a de Polignac number, because 40842181 - 2³ = 40842173 is a prime.

It is a super-2 number, since 2×40842181² = 3336167497673522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40842187) 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, 887851 + ... + 887896.

It is an arithmetic number, because the mean of its divisors is an integer number (10654488).

Almost surely, 2^40842181 is an apocalyptic number.

It is an amenable number.

40842181 is a deficient number, since it is larger than the sum of its proper divisors (1775771).

40842181 is a wasteful number, since it uses less digits than its factorization.

40842181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775770.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 40842181 is about 6390.7887619605. The cubic root of 40842181 is about 344.3787208358.

Adding to 40842181 its reverse (18124804), we get a palindrome (58966985).

The spelling of 40842181 in words is "forty million, eight hundred forty-two thousand, one hundred eighty-one".