40287081 has 4 divisors (see below), whose sum is σ = 53716112. Its totient is φ = 26858052.

The previous prime is 40287017. The next prime is 40287089. The reversal of 40287081 is 18078204.

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 not a de Polignac number, because 40287081 - 2⁶ = 40287017 is a prime.

It is a super-2 number, since 2×40287081² = 3246097791001122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40287089) 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, 6714511 + ... + 6714516.

It is an arithmetic number, because the mean of its divisors is an integer number (13429028).

Almost surely, 2^40287081 is an apocalyptic number.

It is an amenable number.

40287081 is a deficient number, since it is larger than the sum of its proper divisors (13429031).

40287081 is a wasteful number, since it uses less digits than its factorization.

40287081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13429030.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 40287081 is about 6347.2104896561. The cubic root of 40287081 is about 342.8114091032.

The spelling of 40287081 in words is "forty million, two hundred eighty-seven thousand, eighty-one".