423978 has 8 divisors (see below), whose sum is σ = 847968. Its totient is φ = 141324.

The previous prime is 423977. The next prime is 423989. The reversal of 423978 is 879324.

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

423978 is an admirable number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (423977) 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, 35326 + ... + 35337.

It is an arithmetic number, because the mean of its divisors is an integer number (105996).

2⁴²³⁹⁷⁸ is an apocalyptic number.

423978 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.

423978 is a wasteful number, since it uses less digits than its factorization.

423978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70668.

The product of its digits is 12096, while the sum is 33.

The square root of 423978 is about 651.1359305091. The cubic root of 423978 is about 75.1244157178.

The spelling of 423978 in words is "four hundred twenty-three thousand, nine hundred seventy-eight".