40109638 has 4 divisors (see below), whose sum is σ = 60164460. Its totient is φ = 20054818.

The previous prime is 40109633. The next prime is 40109653. The reversal of 40109638 is 83690104.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40109633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10027408 + ... + 10027411.

It is an arithmetic number, because the mean of its divisors is an integer number (15041115).

Almost surely, 2^40109638 is an apocalyptic number.

40109638 is a deficient number, since it is larger than the sum of its proper divisors (20054822).

40109638 is a wasteful number, since it uses less digits than its factorization.

40109638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20054821.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 40109638 is about 6333.2170340199. The cubic root of 40109638 is about 342.3073681914.

The spelling of 40109638 in words is "forty million, one hundred nine thousand, six hundred thirty-eight".