689998 has 12 divisors (see below), whose sum is σ = 1072440. Its totient is φ = 332940.

The previous prime is 689987. The next prime is 690037. The reversal of 689998 is 899986.

689998 is nontrivially palindromic in base 15.

689998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1743 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (89370).

2⁶⁸⁹⁹⁹⁸ is an apocalyptic number.

689998 is a deficient number, since it is larger than the sum of its proper divisors (382442).

689998 is a wasteful number, since it uses less digits than its factorization.

689998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 392 counting only the distinct ones).

The product of its digits is 279936, while the sum is 49.

The square root of 689998 is about 830.6611824324. The cubic root of 689998 is about 88.3654738466.

The spelling of 689998 in words is "six hundred eighty-nine thousand, nine hundred ninety-eight".