40204040 has 16 divisors (see below), whose sum is σ = 90459180. Its totient is φ = 16081600.

The previous prime is 40204039. The next prime is 40204049. The reversal of 40204040 is 4040204.

It can be written as a sum of positive squares in 2 ways, for example, as 38019556 + 2184484 = 6166^2 + 1478^2 .

It is not an unprimeable number, because it can be changed into a prime (40204049) 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, 502511 + ... + 502590.

Almost surely, 2^40204040 is an apocalyptic number.

40204040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40204040 is an abundant number, since it is smaller than the sum of its proper divisors (50255140).

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

40204040 is a wasteful number, since it uses less digits than its factorization.

40204040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005112 (or 1005108 counting only the distinct ones).

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

The square root of 40204040 is about 6340.6655802053. The cubic root of 40204040 is about 342.5757091944.

Adding to 40204040 its reverse (4040204), we get a palindrome (44244244).

The spelling of 40204040 in words is "forty million, two hundred four thousand, forty".