167978 has 8 divisors (see below), whose sum is σ = 257472. Its totient is φ = 82156.

The previous prime is 167971. The next prime is 167987. The reversal of 167978 is 879761.

It is a happy number.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (167971) by changing a digit.

167978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 987.

It is an arithmetic number, because the mean of its divisors is an integer number (32184).

2¹⁶⁷⁹⁷⁸ is an apocalyptic number.

167978 is a deficient number, since it is larger than the sum of its proper divisors (89494).

167978 is a wasteful number, since it uses less digits than its factorization.

167978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836.

The product of its digits is 21168, while the sum is 38.

The square root of 167978 is about 409.8511925077. The cubic root of 167978 is about 55.1760748379.

The spelling of 167978 in words is "one hundred sixty-seven thousand, nine hundred seventy-eight".