42478 has 8 divisors (see below), whose sum is σ = 64872. Its totient is φ = 20856.

The previous prime is 42473. The next prime is 42487. The reversal of 42478 is 87424.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42473) 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, 25 + ... + 292.

It is an arithmetic number, because the mean of its divisors is an integer number (8109).

2⁴²⁴⁷⁸ is an apocalyptic number.

42478 is a deficient number, since it is larger than the sum of its proper divisors (22394).

42478 is a wasteful number, since it uses less digits than its factorization.

42478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386.

The product of its digits is 1792, while the sum is 25.

The square root of 42478 is about 206.1019165365. The cubic root of 42478 is about 34.8916376382.

The spelling of 42478 in words is "forty-two thousand, four hundred seventy-eight".