40404540 has 96 divisors (see below), whose sum is σ = 127733760. Its totient is φ = 9452800.

The previous prime is 40404527. The next prime is 40404547. The reversal of 40404540 is 4540404.

It is a super-2 number, since 2×40404540² = 3265053705223200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40404547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18085 + ... + 20195.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^40404540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40404540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63866880).

40404540 is an abundant number, since it is smaller than the sum of its proper divisors (87329220).

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

40404540 is a wasteful number, since it uses less digits than its factorization.

40404540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163 (or 2161 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 40404540 is about 6356.4565600655. The cubic root of 40404540 is about 343.1442471146.

Adding to 40404540 its reverse (4540404), we get a palindrome (44944944).

The spelling of 40404540 in words is "forty million, four hundred four thousand, five hundred forty".