427978 has 4 divisors (see below), whose sum is σ = 641970. Its totient is φ = 213988.

The previous prime is 427969. The next prime is 427991. The reversal of 427978 is 879724.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 273529 + 154449 = 523^2 + 393^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106993 + ... + 106996.

2⁴²⁷⁹⁷⁸ is an apocalyptic number.

427978 is a deficient number, since it is larger than the sum of its proper divisors (213992).

427978 is a wasteful number, since it uses less digits than its factorization.

427978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213991.

The product of its digits is 28224, while the sum is 37.

The square root of 427978 is about 654.2002751452. The cubic root of 427978 is about 75.3599291759.

The spelling of 427978 in words is "four hundred twenty-seven thousand, nine hundred seventy-eight".