40731638 has 4 divisors (see below), whose sum is σ = 61097460. Its totient is φ = 20365818.

The previous prime is 40731637. The next prime is 40731671. The reversal of 40731638 is 83613704.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40731637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10182908 + ... + 10182911.

It is an arithmetic number, because the mean of its divisors is an integer number (15274365).

Almost surely, 2^40731638 is an apocalyptic number.

40731638 is a deficient number, since it is larger than the sum of its proper divisors (20365822).

40731638 is a wasteful number, since it uses less digits than its factorization.

40731638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20365821.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 40731638 is about 6382.1342825108. The cubic root of 40731638 is about 344.0677428783.

The spelling of 40731638 in words is "forty million, seven hundred thirty-one thousand, six hundred thirty-eight".