689974 has 4 divisors (see below), whose sum is σ = 1034964. Its totient is φ = 344986.

The previous prime is 689963. The next prime is 689981. The reversal of 689974 is 479986.

689974 is digitally balanced in base 2, 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.

It is a self number, because there is not a number n which added to its sum of digits gives 689974.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172492 + ... + 172495.

It is an arithmetic number, because the mean of its divisors is an integer number (258741).

2⁶⁸⁹⁹⁷⁴ is an apocalyptic number.

689974 is a deficient number, since it is larger than the sum of its proper divisors (344990).

689974 is a wasteful number, since it uses less digits than its factorization.

689974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344989.

The product of its digits is 108864, while the sum is 43.

The square root of 689974 is about 830.6467359835. The cubic root of 689974 is about 88.3644493045.

The spelling of 689974 in words is "six hundred eighty-nine thousand, nine hundred seventy-four".