40173991 has 16 divisors (see below), whose sum is σ = 47376000. Its totient is φ = 33585120.

The previous prime is 40173967. The next prime is 40174007. The reversal of 40173991 is 19937104.

It is a cyclic number.

It is not a de Polignac number, because 40173991 - 2¹³ = 40165799 is a prime.

It is a super-2 number, since 2×40173991² = 3227899105736162, 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 (40173491) 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 15 ways as a sum of consecutive naturals, for example, 71076 + ... + 71638.

It is an arithmetic number, because the mean of its divisors is an integer number (2961000).

Almost surely, 2^40173991 is an apocalyptic number.

40173991 is a deficient number, since it is larger than the sum of its proper divisors (7202009).

40173991 is a wasteful number, since it uses less digits than its factorization.

40173991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 40173991 is about 6338.2955910876. The cubic root of 40173991 is about 342.4903394721.

It can be divided in two parts, 4017 and 3991, that added together give a palindrome (8008).

The spelling of 40173991 in words is "forty million, one hundred seventy-three thousand, nine hundred ninety-one".