40021140 has 24 divisors (see below), whose sum is σ = 112059360. Its totient is φ = 10672288.

The previous prime is 40021123. The next prime is 40021147. The reversal of 40021140 is 4112004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021147) 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 7 ways as a sum of consecutive naturals, for example, 333450 + ... + 333569.

It is an arithmetic number, because the mean of its divisors is an integer number (4669140).

Almost surely, 2^40021140 is an apocalyptic number.

It is an amenable number.

40021140 is an abundant number, since it is smaller than the sum of its proper divisors (72038220).

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

40021140 is a wasteful number, since it uses less digits than its factorization.

40021140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667031 (or 667029 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 40021140 is about 6326.2263633228. The cubic root of 40021140 is about 342.0554268773.

Adding to 40021140 its reverse (4112004), we get a palindrome (44133144).

The spelling of 40021140 in words is "forty million, twenty-one thousand, one hundred forty".