158978 has 8 divisors (see below), whose sum is σ = 246780. Its totient is φ = 76720.

The previous prime is 158959. The next prime is 158981. The reversal of 158978 is 879851.

It can be written as a sum of positive squares in 2 ways, for example, as 157609 + 1369 = 397^2 + 37^2 .

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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1313 + ... + 1428.

2¹⁵⁸⁹⁷⁸ is an apocalyptic number.

158978 is a deficient number, since it is larger than the sum of its proper divisors (87802).

158978 is a wasteful number, since it uses less digits than its factorization.

158978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2772.

The product of its digits is 20160, while the sum is 38.

The square root of 158978 is about 398.7204534508. The cubic root of 158978 is about 54.1725163965.

The spelling of 158978 in words is "one hundred fifty-eight thousand, nine hundred seventy-eight".