40120420542 has 16 divisors (see below), whose sum is σ = 80684162832. Its totient is φ = 13299586560.

The previous prime is 40120420537. The next prime is 40120420601. The reversal of 40120420542 is 24502402104.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18470563 + ... + 18472734.

It is an arithmetic number, because the mean of its divisors is an integer number (5042760177).

Almost surely, 2^40120420542 is an apocalyptic number.

40120420542 is an abundant number, since it is smaller than the sum of its proper divisors (40563742290).

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

40120420542 is a wasteful number, since it uses less digits than its factorization.

40120420542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36943483.

The product of its (nonzero) digits is 2560, while the sum is 24.

Adding to 40120420542 its reverse (24502402104), we get a palindrome (64622822646).

The spelling of 40120420542 in words is "forty billion, one hundred twenty million, four hundred twenty thousand, five hundred forty-two".