40020542 has 4 divisors (see below), whose sum is σ = 60030816. Its totient is φ = 20010270.

The previous prime is 40020527. The next prime is 40020599. The reversal of 40020542 is 24502004.

40020542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 40020542.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10005134 + ... + 10005137.

It is an arithmetic number, because the mean of its divisors is an integer number (15007704).

Almost surely, 2^40020542 is an apocalyptic number.

40020542 is a deficient number, since it is larger than the sum of its proper divisors (20010274).

40020542 is a wasteful number, since it uses less digits than its factorization.

40020542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20010273.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 40020542 is about 6326.1790995829. The cubic root of 40020542 is about 342.0537231930.

Adding to 40020542 its reverse (24502004), we get a palindrome (64522546).

The spelling of 40020542 in words is "forty million, twenty thousand, five hundred forty-two".