689949 has 12 divisors (see below), whose sum is σ = 1073436. Its totient is φ = 424512.

The previous prime is 689929. The next prime is 689951. The reversal of 689949 is 949986.

689949 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 381924 + 308025 = 618^2 + 555^2 .

It is not a de Polignac number, because 689949 - 2⁵ = 689917 is a prime.

689949 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2832 + ... + 3065.

It is an arithmetic number, because the mean of its divisors is an integer number (89453).

2⁶⁸⁹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

689949 is a deficient number, since it is larger than the sum of its proper divisors (383487).

689949 is a wasteful number, since it uses less digits than its factorization.

689949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5916 (or 5913 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 689949 is about 830.6316873320. The cubic root of 689949 is about 88.3633820479.

The spelling of 689949 in words is "six hundred eighty-nine thousand, nine hundred forty-nine".