40638639 has 8 divisors (see below), whose sum is σ = 54396720. Its totient is φ = 26986496.

The previous prime is 40638629. The next prime is 40638673. The reversal of 40638639 is 93683604.

40638639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40638639 - 2¹² = 40634543 is a prime.

It is a super-3 number, since 3×40638639³ (a number of 24 digits) contains 333 as substring.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 40638597 and 40638606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40638629) 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 7 ways as a sum of consecutive naturals, for example, 25584 + ... + 27125.

It is an arithmetic number, because the mean of its divisors is an integer number (6799590).

Almost surely, 2^40638639 is an apocalyptic number.

40638639 is a deficient number, since it is larger than the sum of its proper divisors (13758081).

40638639 is a wasteful number, since it uses less digits than its factorization.

40638639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52969.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 40638639 is about 6374.8442333911. The cubic root of 40638639 is about 343.8056833652.

The spelling of 40638639 in words is "forty million, six hundred thirty-eight thousand, six hundred thirty-nine".