40643287 has 4 divisors (see below), whose sum is σ = 40658560. Its totient is φ = 40628016.

The previous prime is 40643269. The next prime is 40643321. The reversal of 40643287 is 78234604.

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 40643287 - 2¹⁵ = 40610519 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 (40643257) 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, 2487 + ... + 9352.

It is an arithmetic number, because the mean of its divisors is an integer number (10164640).

Almost surely, 2^40643287 is an apocalyptic number.

40643287 is a deficient number, since it is larger than the sum of its proper divisors (15273).

40643287 is a wasteful number, since it uses less digits than its factorization.

40643287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15272.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 40643287 is about 6375.2087808949. The cubic root of 40643287 is about 343.8187903321.

The spelling of 40643287 in words is "forty million, six hundred forty-three thousand, two hundred eighty-seven".