168978842 has 8 divisors (see below), whose sum is σ = 253550196. Its totient is φ = 84462112.

The previous prime is 168978841. The next prime is 168978847. The reversal of 168978842 is 248879861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 167159041 + 1819801 = 12929^2 + 1349^2 .

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

It is not an unprimeable number, because it can be changed into a prime (168978841) 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, 4763 + ... + 18990.

Almost surely, 2^168978842 is an apocalyptic number.

168978842 is a deficient number, since it is larger than the sum of its proper divisors (84571354).

168978842 is a wasteful number, since it uses less digits than its factorization.

168978842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27312.

The product of its digits is 1548288, while the sum is 53.

The square root of 168978842 is about 12999.1862052976. The cubic root of 168978842 is about 552.8544078571.

The spelling of 168978842 in words is "one hundred sixty-eight million, nine hundred seventy-eight thousand, eight hundred forty-two".