40289181 has 16 divisors (see below), whose sum is σ = 55891968. Its totient is φ = 25786800.

The previous prime is 40289173. The next prime is 40289191. The reversal of 40289181 is 18198204.

It is not a de Polignac number, because 40289181 - 2³ = 40289173 is a prime.

It is a super-2 number, since 2×40289181² = 3246436211301522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40289111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10530 + ... + 13836.

It is an arithmetic number, because the mean of its divisors is an integer number (3493248).

Almost surely, 2^40289181 is an apocalyptic number.

It is an amenable number.

40289181 is a deficient number, since it is larger than the sum of its proper divisors (15602787).

40289181 is a wasteful number, since it uses less digits than its factorization.

40289181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3472.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 40289181 is about 6347.3759145020. The cubic root of 40289181 is about 342.8173654498.

It can be divided in two parts, 40289 and 181, that added together give a triangular number (40470 = T₂₈₄).

The spelling of 40289181 in words is "forty million, two hundred eighty-nine thousand, one hundred eighty-one".