40420042 has 16 divisors (see below), whose sum is σ = 65463552. Its totient is φ = 18606960.

The previous prime is 40420013. The next prime is 40420057. The reversal of 40420042 is 24002404.

It is a junction number, because it is equal to n+sod(n) for n = 40419998 and 40420025.

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 7 ways as a sum of consecutive naturals, for example, 9403 + ... + 13009.

It is an arithmetic number, because the mean of its divisors is an integer number (4091472).

Almost surely, 2^40420042 is an apocalyptic number.

40420042 is a deficient number, since it is larger than the sum of its proper divisors (25043510).

40420042 is a wasteful number, since it uses less digits than its factorization.

40420042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4053.

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 40420042 is about 6357.6758331956. The cubic root of 40420042 is about 343.1881261932.

Adding to 40420042 its reverse (24002404), we get a palindrome (64422446).

The spelling of 40420042 in words is "forty million, four hundred twenty thousand, forty-two".