684405903 has 4 divisors (see below), whose sum is σ = 912541208. Its totient is φ = 456270600.

The previous prime is 684405901. The next prime is 684405923. The reversal of 684405903 is 309504486.

684405903 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 684405903 - 2¹ = 684405901 is a prime.

It is a super-2 number, since 2×684405903² = 936822880122490818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684405901) 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, 114067648 + ... + 114067653.

It is an arithmetic number, because the mean of its divisors is an integer number (228135302).

Almost surely, 2^684405903 is an apocalyptic number.

684405903 is a deficient number, since it is larger than the sum of its proper divisors (228135305).

684405903 is a wasteful number, since it uses less digits than its factorization.

684405903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228135304.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 684405903 is about 26161.1525548857. The cubic root of 684405903 is about 881.2610634696.

The spelling of 684405903 in words is "six hundred eighty-four million, four hundred five thousand, nine hundred three".