684138453 has 16 divisors (see below), whose sum is σ = 976473600. Its totient is φ = 424761840.

The previous prime is 684138443. The next prime is 684138493. The reversal of 684138453 is 354831486.

It is not a de Polignac number, because 684138453 - 2⁵ = 684138421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684138443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98353 + ... + 105078.

It is an arithmetic number, because the mean of its divisors is an integer number (61029600).

Almost surely, 2^684138453 is an apocalyptic number.

It is an amenable number.

684138453 is a deficient number, since it is larger than the sum of its proper divisors (292335147).

684138453 is a wasteful number, since it uses less digits than its factorization.

684138453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203512.

The product of its digits is 276480, while the sum is 42.

The square root of 684138453 is about 26156.0404686948. The cubic root of 684138453 is about 881.1462563655.

The spelling of 684138453 in words is "six hundred eighty-four million, one hundred thirty-eight thousand, four hundred fifty-three".