40044820 has 24 divisors (see below), whose sum is σ = 84272328. Its totient is φ = 15984000.

The previous prime is 40044811. The next prime is 40044821. The reversal of 40044820 is 2844004.

It can be written as a sum of positive squares in 4 ways, for example, as 1926544 + 38118276 = 1388^2 + 6174^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40044791 and 40044800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40044821) 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, 8970 + ... + 12670.

It is an arithmetic number, because the mean of its divisors is an integer number (3511347).

Almost surely, 2^40044820 is an apocalyptic number.

It is an amenable number.

40044820 is an abundant number, since it is smaller than the sum of its proper divisors (44227508).

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

40044820 is a wasteful number, since it uses less digits than its factorization.

40044820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4251 (or 4249 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 40044820 is about 6328.0976604348. The cubic root of 40044820 is about 342.1228768591.

Adding to 40044820 its reverse (2844004), we get a palindrome (42888824).

The spelling of 40044820 in words is "forty million, forty-four thousand, eight hundred twenty".