40281287 has 4 divisors (see below), whose sum is σ = 40696656. Its totient is φ = 39865920.

The previous prime is 40281281. The next prime is 40281301. The reversal of 40281287 is 78218204.

40281287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40281287 - 2¹⁰ = 40280263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40281281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207539 + ... + 207732.

It is an arithmetic number, because the mean of its divisors is an integer number (10174164).

Almost surely, 2^40281287 is an apocalyptic number.

40281287 is a deficient number, since it is larger than the sum of its proper divisors (415369).

40281287 is an equidigital number, since it uses as much as digits as its factorization.

40281287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415368.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 40281287 is about 6346.7540522696. The cubic root of 40281287 is about 342.7949741859.

The spelling of 40281287 in words is "forty million, two hundred eighty-one thousand, two hundred eighty-seven".