42821178 has 8 divisors (see below), whose sum is σ = 85642368. Its totient is φ = 14273724.

The previous prime is 42821171. The next prime is 42821189. The reversal of 42821178 is 87112824.

It is a happy number.

42821178 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

42821178 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42821171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3568426 + ... + 3568437.

It is an arithmetic number, because the mean of its divisors is an integer number (10705296).

Almost surely, 2^42821178 is an apocalyptic number.

42821178 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

42821178 is a wasteful number, since it uses less digits than its factorization.

42821178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7136868.

The product of its digits is 7168, while the sum is 33.

The square root of 42821178 is about 6543.7892692231. The cubic root of 42821178 is about 349.8534842529.

It can be divided in two parts, 4282 and 1178, that added together give a triangular number (5460 = T₁₀₄).

The spelling of 42821178 in words is "forty-two million, eight hundred twenty-one thousand, one hundred seventy-eight".