40540181 has 4 divisors (see below), whose sum is σ = 44225664. Its totient is φ = 36854700.

The previous prime is 40540163. The next prime is 40540217. The reversal of 40540181 is 18104504.

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 40540181 - 2⁶ = 40540117 is a prime.

It is a super-2 number, since 2×40540181² = 3287012551025522, 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 (40540111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1842725 + ... + 1842746.

It is an arithmetic number, because the mean of its divisors is an integer number (11056416).

Almost surely, 2^40540181 is an apocalyptic number.

It is an amenable number.

40540181 is a deficient number, since it is larger than the sum of its proper divisors (3685483).

40540181 is a wasteful number, since it uses less digits than its factorization.

40540181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685482.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 40540181 is about 6367.1171655624. The cubic root of 40540181 is about 343.5278050134.

Adding to 40540181 its reverse (18104504), we get a palindrome (58644685).

The spelling of 40540181 in words is "forty million, five hundred forty thousand, one hundred eighty-one".