40287639 has 16 divisors (see below), whose sum is σ = 61483520. Its totient is φ = 22986720.

The previous prime is 40287629. The next prime is 40287647. The reversal of 40287639 is 93678204.

It is not a de Polignac number, because 40287639 - 2⁵ = 40287607 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 40287597 and 40287606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40287629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20502 + ... + 22380.

It is an arithmetic number, because the mean of its divisors is an integer number (3842720).

Almost surely, 2^40287639 is an apocalyptic number.

40287639 is a deficient number, since it is larger than the sum of its proper divisors (21195881).

40287639 is a wasteful number, since it uses less digits than its factorization.

40287639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2910.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 40287639 is about 6347.2544458214. The cubic root of 40287639 is about 342.8129918098.

The spelling of 40287639 in words is "forty million, two hundred eighty-seven thousand, six hundred thirty-nine".