40321687 has 16 divisors (see below), whose sum is σ = 47900160. Its totient is φ = 33209568.

The previous prime is 40321663. The next prime is 40321709. The reversal of 40321687 is 78612304.

40321687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40321687 - 2¹⁹ = 39797399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40321657) 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 15 ways as a sum of consecutive naturals, for example, 61998 + ... + 62644.

It is an arithmetic number, because the mean of its divisors is an integer number (2993760).

Almost surely, 2^40321687 is an apocalyptic number.

40321687 is a deficient number, since it is larger than the sum of its proper divisors (7578473).

40321687 is a wasteful number, since it uses less digits than its factorization.

40321687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 40321687 is about 6349.9359839293. The cubic root of 40321687 is about 342.9095376359.

The spelling of 40321687 in words is "forty million, three hundred twenty-one thousand, six hundred eighty-seven".