40472181 has 6 divisors (see below), whose sum is σ = 58459830. Its totient is φ = 26981448.

The previous prime is 40472161. The next prime is 40472209. The reversal of 40472181 is 18127404.

It can be written as a sum of positive squares in only one way, i.e., 29877156 + 10595025 = 5466^2 + 3255^2 .

It is not a de Polignac number, because 40472181 - 2¹⁰ = 40471157 is a prime.

It is a super-2 number, since 2×40472181² = 3275994869793522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40472101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2248446 + ... + 2248463.

It is an arithmetic number, because the mean of its divisors is an integer number (9743305).

Almost surely, 2^40472181 is an apocalyptic number.

It is an amenable number.

40472181 is a deficient number, since it is larger than the sum of its proper divisors (17987649).

40472181 is a wasteful number, since it uses less digits than its factorization.

40472181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4496915 (or 4496912 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 40472181 is about 6361.7749881617. The cubic root of 40472181 is about 343.3356256065.

Adding to 40472181 its reverse (18127404), we get a palindrome (58599585).

The spelling of 40472181 in words is "forty million, four hundred seventy-two thousand, one hundred eighty-one".