40585181 has 30 divisors (see below), whose sum is σ = 52909110. Its totient is φ = 31004064.

The previous prime is 40585177. The next prime is 40585187. The reversal of 40585181 is 18158504.

It can be written as a sum of positive squares in 5 ways, for example, as 34164025 + 6421156 = 5845^2 + 2534^2 .

It is not a de Polignac number, because 40585181 - 2² = 40585177 is a prime.

It is a super-2 number, since 2×40585181² = 3294313833605522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40585187) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1399475 + ... + 1399503.

It is an arithmetic number, because the mean of its divisors is an integer number (1763637).

Almost surely, 2^40585181 is an apocalyptic number.

It is an amenable number.

40585181 is a deficient number, since it is larger than the sum of its proper divisors (12323929).

40585181 is an frugal number, since it uses more digits than its factorization.

40585181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 40585181 is about 6370.6499668401. The cubic root of 40585181 is about 343.6548644277.

The spelling of 40585181 in words is "forty million, five hundred eighty-five thousand, one hundred eighty-one".