40087181 has 4 divisors (see below), whose sum is σ = 40327392. Its totient is φ = 39846972.

The previous prime is 40087129. The next prime is 40087219. The reversal of 40087181 is 18178004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40087181 is a prime.

It is a super-2 number, since 2×40087181² = 3213964161053522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40087111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119855 + ... + 120188.

It is an arithmetic number, because the mean of its divisors is an integer number (10081848).

Almost surely, 2^40087181 is an apocalyptic number.

It is an amenable number.

40087181 is a deficient number, since it is larger than the sum of its proper divisors (240211).

40087181 is a wasteful number, since it uses less digits than its factorization.

40087181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240210.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 40087181 is about 6331.4438321760. The cubic root of 40087181 is about 342.2434713986.

The spelling of 40087181 in words is "forty million, eighty-seven thousand, one hundred eighty-one".