684954 has 12 divisors (see below), whose sum is σ = 1484106. Its totient is φ = 228312.

The previous prime is 684949. The next prime is 684961. The reversal of 684954 is 459486.

It can be written as a sum of positive squares in only one way, i.e., 603729 + 81225 = 777^2 + 285^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19009 + ... + 19044.

2⁶⁸⁴⁹⁵⁴ is an apocalyptic number.

684954 is an abundant number, since it is smaller than the sum of its proper divisors (799152).

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

684954 is a wasteful number, since it uses less digits than its factorization.

684954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38061 (or 38058 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 684954 is about 827.6194777795. The cubic root of 684954 is about 88.1496249276.

It can be divided in two parts, 6849 and 54, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 684954 in words is "six hundred eighty-four thousand, nine hundred fifty-four".