349978 has 4 divisors (see below), whose sum is σ = 524970. Its totient is φ = 174988.

The previous prime is 349967. The next prime is 349981. The reversal of 349978 is 879943.

349978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879943 = 89 ⋅9887.

It can be written as a sum of positive squares in only one way, i.e., 243049 + 106929 = 493^2 + 327^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 349978.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 87493 + ... + 87496.

2³⁴⁹⁹⁷⁸ is an apocalyptic number.

349978 is a deficient number, since it is larger than the sum of its proper divisors (174992).

349978 is a wasteful number, since it uses less digits than its factorization.

349978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174991.

The product of its digits is 54432, while the sum is 40.

The square root of 349978 is about 591.5893846242. The cubic root of 349978 is about 70.4715107128.

The spelling of 349978 in words is "three hundred forty-nine thousand, nine hundred seventy-eight".