684057194 has 4 divisors (see below), whose sum is σ = 1026085794. Its totient is φ = 342028596.

The previous prime is 684057193. The next prime is 684057197. The reversal of 684057194 is 491750486.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 680949025 + 3108169 = 26095^2 + 1763^2 .

It is not an unprimeable number, because it can be changed into a prime (684057193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171014297 + ... + 171014300.

Almost surely, 2^684057194 is an apocalyptic number.

684057194 is a deficient number, since it is larger than the sum of its proper divisors (342028600).

684057194 is a wasteful number, since it uses less digits than its factorization.

684057194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342028599.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 684057194 is about 26154.4870720112. The cubic root of 684057194 is about 881.1113687399. Note that the first 3 decimals are identical.

The spelling of 684057194 in words is "six hundred eighty-four million, fifty-seven thousand, one hundred ninety-four".