40731018 has 16 divisors (see below), whose sum is σ = 81850656. Its totient is φ = 13512240.

The previous prime is 40731017. The next prime is 40731049. The reversal of 40731018 is 81013704.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40731017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14821 + ... + 17352.

It is an arithmetic number, because the mean of its divisors is an integer number (5115666).

Almost surely, 2^40731018 is an apocalyptic number.

40731018 is an abundant number, since it is smaller than the sum of its proper divisors (41119638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40731018 is a wasteful number, since it uses less digits than its factorization.

40731018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32389.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 40731018 is about 6382.0857092333. The cubic root of 40731018 is about 344.0659971176.

The spelling of 40731018 in words is "forty million, seven hundred thirty-one thousand, eighteen".