42178772 has 6 divisors (see below), whose sum is σ = 73812858. Its totient is φ = 21089384.

The previous prime is 42178769. The next prime is 42178813. The reversal of 42178772 is 27787124.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30096196 + 12082576 = 5486^2 + 3476^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5272343 + ... + 5272350.

It is an arithmetic number, because the mean of its divisors is an integer number (12302143).

Almost surely, 2^42178772 is an apocalyptic number.

It is an amenable number.

42178772 is a deficient number, since it is larger than the sum of its proper divisors (31634086).

42178772 is a wasteful number, since it uses less digits than its factorization.

42178772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10544697 (or 10544695 counting only the distinct ones).

The product of its digits is 43904, while the sum is 38.

The square root of 42178772 is about 6494.5186118757. The cubic root of 42178772 is about 348.0951538801.

The spelling of 42178772 in words is "forty-two million, one hundred seventy-eight thousand, seven hundred seventy-two".