1684404145 has 8 divisors (see below), whose sum is σ = 2021535720. Its totient is φ = 1347356160.

The previous prime is 1684404097. The next prime is 1684404151. The reversal of 1684404145 is 5414044861.

It can be written as a sum of positive squares in 4 ways, for example, as 364389921 + 1320014224 = 19089^2 + 36332^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1684404145 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39105 + ... + 69985.

It is an arithmetic number, because the mean of its divisors is an integer number (252691965).

Almost surely, 2^1684404145 is an apocalyptic number.

It is an amenable number.

1684404145 is a deficient number, since it is larger than the sum of its proper divisors (337131575).

1684404145 is a wasteful number, since it uses less digits than its factorization.

1684404145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41795.

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 1684404145 is about 41041.4929674835. The cubic root of 1684404145 is about 1189.8222894478.

The spelling of 1684404145 in words is "one billion, six hundred eighty-four million, four hundred four thousand, one hundred forty-five".