684142 has 4 divisors (see below), whose sum is σ = 1026216. Its totient is φ = 342070.

The previous prime is 684127. The next prime is 684157. The reversal of 684142 is 241486.

684142 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 an interprime number because it is at equal distance from previous prime (684127) and next prime (684157).

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, 171034 + ... + 171037.

It is an arithmetic number, because the mean of its divisors is an integer number (256554).

2⁶⁸⁴¹⁴² is an apocalyptic number.

684142 is a deficient number, since it is larger than the sum of its proper divisors (342074).

684142 is a wasteful number, since it uses less digits than its factorization.

684142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342073.

The product of its digits is 1536, while the sum is 25.

The square root of 684142 is about 827.1287686932. The cubic root of 684142 is about 88.1147779167.

It can be divided in two parts, 6 and 84142, that added together give a palindrome (84148).

The spelling of 684142 in words is "six hundred eighty-four thousand, one hundred forty-two".