40424040 has 48 divisors (see below), whose sum is σ = 131379300. Its totient is φ = 10779648.

The previous prime is 40424009. The next prime is 40424051. The reversal of 40424040 is 4042404.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 36942084 + 3481956 = 6078^2 + 1866^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 55785 + ... + 56504.

Almost surely, 2^40424040 is an apocalyptic number.

40424040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40424040 is an abundant number, since it is smaller than the sum of its proper divisors (90955260).

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

40424040 is a wasteful number, since it uses less digits than its factorization.

40424040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112306 (or 112299 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 40424040 is about 6357.9902484983. The cubic root of 40424040 is about 343.1994408845.

Adding to 40424040 its reverse (4042404), we get a palindrome (44466444).

The spelling of 40424040 in words is "forty million, four hundred twenty-four thousand, forty".