684902 has 4 divisors (see below), whose sum is σ = 1027356. Its totient is φ = 342450.

The previous prime is 684889. The next prime is 684923. The reversal of 684902 is 209486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 209486 = 2 ⋅104743.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 171224 + ... + 171227.

It is an arithmetic number, because the mean of its divisors is an integer number (256839).

2⁶⁸⁴⁹⁰² is an apocalyptic number.

684902 is a deficient number, since it is larger than the sum of its proper divisors (342454).

684902 is a wasteful number, since it uses less digits than its factorization.

684902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342453.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 684902 is about 827.5880617795. The cubic root of 684902 is about 88.1473941713.

It can be divided in two parts, 68 and 4902, that multiplied together give a triangular number (333336 = T₈₁₆).

The spelling of 684902 in words is "six hundred eighty-four thousand, nine hundred two".