40020438 has 8 divisors (see below), whose sum is σ = 80040888. Its totient is φ = 13340144.

The previous prime is 40020433. The next prime is 40020443. The reversal of 40020438 is 83402004.

It is a happy number.

40020438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40020433) and next prime (40020443).

It is a sphenic number, since it is the product of 3 distinct primes.

40020438 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40020433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335031 + ... + 3335042.

It is an arithmetic number, because the mean of its divisors is an integer number (10005111).

Almost surely, 2^40020438 is an apocalyptic number.

40020438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

40020438 is a wasteful number, since it uses less digits than its factorization.

40020438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670078.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 40020438 is about 6326.1708797661. The cubic root of 40020438 is about 342.0534268983.

The spelling of 40020438 in words is "forty million, twenty thousand, four hundred thirty-eight".