40687943 has 4 divisors (see below), whose sum is σ = 42457008. Its totient is φ = 38918880.

The previous prime is 40687921. The next prime is 40687967. The reversal of 40687943 is 34978604.

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 40687943 - 2⁸ = 40687687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40687943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40687973) 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, 884498 + ... + 884543.

It is an arithmetic number, because the mean of its divisors is an integer number (10614252).

Almost surely, 2^40687943 is an apocalyptic number.

40687943 is a deficient number, since it is larger than the sum of its proper divisors (1769065).

40687943 is a wasteful number, since it uses less digits than its factorization.

40687943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769064.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 40687943 is about 6378.7101360698. The cubic root of 40687943 is about 343.9446655858.

The spelling of 40687943 in words is "forty million, six hundred eighty-seven thousand, nine hundred forty-three".