40020812 has 24 divisors (see below), whose sum is σ = 78027600. Its totient is φ = 17833536.

The previous prime is 40020809. The next prime is 40020817. The reversal of 40020812 is 21802004.

It is not an unprimeable number, because it can be changed into a prime (40020817) 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, 11762 + ... + 14777.

It is an arithmetic number, because the mean of its divisors is an integer number (3251150).

Almost surely, 2^40020812 is an apocalyptic number.

It is an amenable number.

40020812 is a deficient number, since it is larger than the sum of its proper divisors (38006788).

40020812 is a wasteful number, since it uses less digits than its factorization.

40020812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26585 (or 26583 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 40020812 is about 6326.2004394423. The cubic root of 40020812 is about 342.0544924171.

Adding to 40020812 its reverse (21802004), we get a palindrome (61822816).

It can be divided in two parts, 400 and 20812, that added together give a palindrome (21212).

The spelling of 40020812 in words is "forty million, twenty thousand, eight hundred twelve".