699978 has 8 divisors (see below), whose sum is σ = 1399968. Its totient is φ = 233324.

The previous prime is 699967. The next prime is 700001. The reversal of 699978 is 879996.

It is a happy number.

699978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

699978 is an admirable number.

It is an unprimeable number.

699978 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, 58326 + ... + 58337.

It is an arithmetic number, because the mean of its divisors is an integer number (174996).

2⁶⁹⁹⁹⁷⁸ is an apocalyptic number.

699978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

699978 is a wasteful number, since it uses less digits than its factorization.

699978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116668.

The product of its digits is 244944, while the sum is 48.

The square root of 699978 is about 836.6468789161. The cubic root of 699978 is about 88.7894699794.

The spelling of 699978 in words is "six hundred ninety-nine thousand, nine hundred seventy-eight".