40042040 has 32 divisors (see below), whose sum is σ = 93204000. Its totient is φ = 15464064.

The previous prime is 40042039. The next prime is 40042043. The reversal of 40042040 is 4024004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16100 + ... + 18419.

It is an arithmetic number, because the mean of its divisors is an integer number (2912625).

Almost surely, 2^40042040 is an apocalyptic number.

40042040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40042040 is an abundant number, since it is smaller than the sum of its proper divisors (53161960).

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

40042040 is a wasteful number, since it uses less digits than its factorization.

40042040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34559 (or 34555 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 40042040 is about 6327.8780013524. The cubic root of 40042040 is about 342.1149597002.

Adding to 40042040 its reverse (4024004), we get a palindrome (44066044).

The spelling of 40042040 in words is "forty million, forty-two thousand, forty", and thus it is an eban number.