40304540 has 24 divisors (see below), whose sum is σ = 85594320. Its totient is φ = 15939968.

The previous prime is 40304527. The next prime is 40304549. The reversal of 40304540 is 4540304.

It is a happy number.

It is a super-2 number, since 2×40304540² = 3248911889223200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40304549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9542 + ... + 13101.

It is an arithmetic number, because the mean of its divisors is an integer number (3566430).

Almost surely, 2^40304540 is an apocalyptic number.

It is an amenable number.

40304540 is an abundant number, since it is smaller than the sum of its proper divisors (45289780).

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

40304540 is a wasteful number, since it uses less digits than its factorization.

40304540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22741 (or 22739 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 40304540 is about 6348.5856692652. The cubic root of 40304540 is about 342.8609227427.

Adding to 40304540 its reverse (4540304), we get a palindrome (44844844).

The spelling of 40304540 in words is "forty million, three hundred four thousand, five hundred forty".