1684396243 has 4 divisors (see below), whose sum is σ = 1684583208. Its totient is φ = 1684209280.

The previous prime is 1684396229. The next prime is 1684396249. The reversal of 1684396243 is 3426934861.

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

It is a cyclic number.

It is not a de Polignac number, because 1684396243 - 2¹³ = 1684388051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1684396193 and 1684396202.

It is not an unprimeable number, because it can be changed into a prime (1684396249) 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, 79246 + ... + 98227.

It is an arithmetic number, because the mean of its divisors is an integer number (421145802).

Almost surely, 2^1684396243 is an apocalyptic number.

1684396243 is a deficient number, since it is larger than the sum of its proper divisors (186965).

1684396243 is an equidigital number, since it uses as much as digits as its factorization.

1684396243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186964.

The product of its digits is 746496, while the sum is 46.

The square root of 1684396243 is about 41041.3966989429. The cubic root of 1684396243 is about 1189.8204288511.

The spelling of 1684396243 in words is "one billion, six hundred eighty-four million, three hundred ninety-six thousand, two hundred forty-three".