684419699 has 4 divisors (see below), whose sum is σ = 684944664. Its totient is φ = 683894736.

The previous prime is 684419689. The next prime is 684419707. The reversal of 684419699 is 996914486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 996914486 = 2 ⋅498457243.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684419699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684419669) 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, 260522 + ... + 263135.

It is an arithmetic number, because the mean of its divisors is an integer number (171236166).

Almost surely, 2^684419699 is an apocalyptic number.

684419699 is a deficient number, since it is larger than the sum of its proper divisors (524965).

684419699 is a wasteful number, since it uses less digits than its factorization.

684419699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524964.

The product of its digits is 3359232, while the sum is 56.

The square root of 684419699 is about 26161.4162269553. The cubic root of 684419699 is about 881.2669848075.

The spelling of 684419699 in words is "six hundred eighty-four million, four hundred nineteen thousand, six hundred ninety-nine".