40032420 has 48 divisors (see below), whose sum is σ = 116968320. Its totient is φ = 10210816.

The previous prime is 40032403. The next prime is 40032451. The reversal of 40032420 is 2423004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 40032420.

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 15 ways as a sum of consecutive naturals, for example, 13125 + ... + 15884.

It is an arithmetic number, because the mean of its divisors is an integer number (2436840).

Almost surely, 2^40032420 is an apocalyptic number.

It is an amenable number.

40032420 is an abundant number, since it is smaller than the sum of its proper divisors (76935900).

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

40032420 is a wasteful number, since it uses less digits than its factorization.

40032420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29044 (or 29042 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 40032420 is about 6327.1178272575. The cubic root of 40032420 is about 342.0875600847.

Adding to 40032420 its reverse (2423004), we get a palindrome (42455424).

The spelling of 40032420 in words is "forty million, thirty-two thousand, four hundred twenty".