109978 has 8 divisors (see below), whose sum is σ = 180000. Its totient is φ = 49980.

The previous prime is 109961. The next prime is 109987. The reversal of 109978 is 879901.

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

It is an Ulam number.

It is a plaindrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2478 + ... + 2521.

It is an arithmetic number, because the mean of its divisors is an integer number (22500).

2¹⁰⁹⁹⁷⁸ is an apocalyptic number.

109978 is a deficient number, since it is larger than the sum of its proper divisors (70022).

109978 is a wasteful number, since it uses less digits than its factorization.

109978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5012.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 109978 is about 331.6293111292. The cubic root of 109978 is about 47.9110040777.

The spelling of 109978 in words is "one hundred nine thousand, nine hundred seventy-eight".