40181405 has 8 divisors (see below), whose sum is σ = 52601184. Its totient is φ = 29222800.

The previous prime is 40181399. The next prime is 40181411. The reversal of 40181405 is 50418104.

It is an interprime number because it is at equal distance from previous prime (40181399) and next prime (40181411).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40181405 - 2⁶ = 40181341 is a prime.

It is a super-2 number, since 2×40181405² = 3229090615548050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365231 + ... + 365340.

It is an arithmetic number, because the mean of its divisors is an integer number (6575148).

Almost surely, 2^40181405 is an apocalyptic number.

It is an amenable number.

40181405 is a deficient number, since it is larger than the sum of its proper divisors (12419779).

40181405 is a wasteful number, since it uses less digits than its factorization.

40181405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730587.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 40181405 is about 6338.8804216518. The cubic root of 40181405 is about 342.5114067276.

Adding to 40181405 its reverse (50418104), we get a palindrome (90599509).

The spelling of 40181405 in words is "forty million, one hundred eighty-one thousand, four hundred five".