40204540 has 12 divisors (see below), whose sum is σ = 84429576. Its totient is φ = 16081808.

The previous prime is 40204511. The next prime is 40204543. The reversal of 40204540 is 4540204.

It is a super-2 number, since 2×40204540² = 3232810073223200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40204543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005094 + ... + 1005133.

It is an arithmetic number, because the mean of its divisors is an integer number (7035798).

Almost surely, 2^40204540 is an apocalyptic number.

It is an amenable number.

40204540 is an abundant number, since it is smaller than the sum of its proper divisors (44225036).

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

40204540 is a wasteful number, since it uses less digits than its factorization.

40204540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010236 (or 2010234 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 40204540 is about 6340.7050081202. The cubic root of 40204540 is about 342.5771293431.

Adding to 40204540 its reverse (4540204), we get a palindrome (44744744).

The spelling of 40204540 in words is "forty million, two hundred four thousand, five hundred forty".