40172743 has 32 divisors (see below), whose sum is σ = 48263040. Its totient is φ = 33116160.

The previous prime is 40172701. The next prime is 40172749. The reversal of 40172743 is 34727104.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40172743 is a prime.

It is a super-2 number, since 2×40172743² = 3227698560288098, 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 (40172749) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 355455 + ... + 355567.

It is an arithmetic number, because the mean of its divisors is an integer number (1508220).

Almost surely, 2^40172743 is an apocalyptic number.

40172743 is a deficient number, since it is larger than the sum of its proper divisors (8090297).

40172743 is a wasteful number, since it uses less digits than its factorization.

40172743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 40172743 is about 6338.1971411435. The cubic root of 40172743 is about 342.4867929622.

Adding to 40172743 its reverse (34727104), we get a palindrome (74899847).

The spelling of 40172743 in words is "forty million, one hundred seventy-two thousand, seven hundred forty-three".