7900042 has 16 divisors (see below), whose sum is σ = 12188160. Its totient is φ = 3838608.

The previous prime is 7900033. The next prime is 7900043. The reversal of 7900042 is 2400097.

It is a junction number, because it is equal to n+sod(n) for n = 7899986 and 7900022.

It is not an unprimeable number, because it can be changed into a prime (7900043) by changing a digit.

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, 21343 + ... + 21709.

It is an arithmetic number, because the mean of its divisors is an integer number (761760).

Almost surely, 2^7900042 is an apocalyptic number.

7900042 is a deficient number, since it is larger than the sum of its proper divisors (4288118).

7900042 is a wasteful number, since it uses less digits than its factorization.

7900042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 7900042 is about 2810.7013359658. The cubic root of 7900042 is about 199.1635230758.

Subtracting from 7900042 its reverse (2400097), we obtain a palindrome (5499945).

The spelling of 7900042 in words is "seven million, nine hundred thousand, forty-two".