40697181 has 16 divisors (see below), whose sum is σ = 68905600. Its totient is φ = 23255424.

The previous prime is 40697177. The next prime is 40697213. The reversal of 40697181 is 18179604.

It is not a de Polignac number, because 40697181 - 2² = 40697177 is a prime.

It is a super-2 number, since 2×40697181² = 3312521082693522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40697161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107476 + ... + 107853.

It is an arithmetic number, because the mean of its divisors is an integer number (4306600).

Almost surely, 2^40697181 is an apocalyptic number.

It is an amenable number.

40697181 is a deficient number, since it is larger than the sum of its proper divisors (28208419).

40697181 is a wasteful number, since it uses less digits than its factorization.

40697181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215345 (or 215339 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 40697181 is about 6379.4342225624. The cubic root of 40697181 is about 343.9706939384.

The spelling of 40697181 in words is "forty million, six hundred ninety-seven thousand, one hundred eighty-one".