684137 has 4 divisors (see below), whose sum is σ = 694416. Its totient is φ = 673860.

The previous prime is 684127. The next prime is 684157. The reversal of 684137 is 731486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 684137 - 2⁴ = 684121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5039 + ... + 5172.

It is an arithmetic number, because the mean of its divisors is an integer number (173604).

2⁶⁸⁴¹³⁷ is an apocalyptic number.

684137 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

684137 is a deficient number, since it is larger than the sum of its proper divisors (10279).

684137 is a wasteful number, since it uses less digits than its factorization.

684137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10278.

The product of its digits is 4032, while the sum is 29.

The square root of 684137 is about 827.1257461837. The cubic root of 684137 is about 88.1145632561.

The spelling of 684137 in words is "six hundred eighty-four thousand, one hundred thirty-seven".