42406778 has 8 divisors (see below), whose sum is σ = 63891072. Its totient is φ = 21109756.

The previous prime is 42406757. The next prime is 42406783. The reversal of 42406778 is 87760424.

42406778 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.

It is a Curzon number.

It is an unprimeable number.

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, 46250 + ... + 47157.

It is an arithmetic number, because the mean of its divisors is an integer number (7986384).

Almost surely, 2^42406778 is an apocalyptic number.

42406778 is a deficient number, since it is larger than the sum of its proper divisors (21484294).

42406778 is a wasteful number, since it uses less digits than its factorization.

42406778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93636.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 42406778 is about 6512.0486791792. The cubic root of 42406778 is about 348.7212602910.

The spelling of 42406778 in words is "forty-two million, four hundred six thousand, seven hundred seventy-eight".