684247123 has 6 divisors (see below), whose sum is σ = 795960996. Its totient is φ = 586497492.

The previous prime is 684247051. The next prime is 684247147. The reversal of 684247123 is 321742486.

It is not a de Polignac number, because 684247123 - 2¹³ = 684238931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684247423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6982065 + ... + 6982162.

It is an arithmetic number, because the mean of its divisors is an integer number (132660166).

Almost surely, 2^684247123 is an apocalyptic number.

684247123 is a deficient number, since it is larger than the sum of its proper divisors (111713873).

684247123 is a wasteful number, since it uses less digits than its factorization.

684247123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13964241 (or 13964234 counting only the distinct ones).

The product of its digits is 64512, while the sum is 37.

The square root of 684247123 is about 26158.1177266255. The cubic root of 684247123 is about 881.1929082743.

The spelling of 684247123 in words is "six hundred eighty-four million, two hundred forty-seven thousand, one hundred twenty-three".