684174042 has 12 divisors (see below), whose sum is σ = 1482377130. Its totient is φ = 228058008.

The previous prime is 684174013. The next prime is 684174047. The reversal of 684174042 is 240471486.

It can be written as a sum of positive squares in only one way, i.e., 574992441 + 109181601 = 23979^2 + 10449^2 .

It is a junction number, because it is equal to n+sod(n) for n = 684173988 and 684174006.

It is not an unprimeable number, because it can be changed into a prime (684174047) 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, 19004817 + ... + 19004852.

Almost surely, 2^684174042 is an apocalyptic number.

684174042 is an abundant number, since it is smaller than the sum of its proper divisors (798203088).

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

684174042 is a wasteful number, since it uses less digits than its factorization.

684174042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38009677 (or 38009674 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 684174042 is about 26156.7207807095. The cubic root of 684174042 is about 881.1615352272.

The spelling of 684174042 in words is "six hundred eighty-four million, one hundred seventy-four thousand, forty-two".