42178636 has 12 divisors (see below), whose sum is σ = 73929240. Its totient is φ = 21056000.

The previous prime is 42178621. The next prime is 42178639. The reversal of 42178636 is 63687124.

It is a junction number, because it is equal to n+sod(n) for n = 42178595 and 42178604.

It is not an unprimeable number, because it can be changed into a prime (42178639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5365 + ... + 10636.

It is an arithmetic number, because the mean of its divisors is an integer number (6160770).

Almost surely, 2^42178636 is an apocalyptic number.

It is an amenable number.

42178636 is a deficient number, since it is larger than the sum of its proper divisors (31750604).

42178636 is a wasteful number, since it uses less digits than its factorization.

42178636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16664 (or 16662 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 42178636 is about 6494.5081414992. The cubic root of 42178636 is about 348.0947797504.

The spelling of 42178636 in words is "forty-two million, one hundred seventy-eight thousand, six hundred thirty-six".