1684297385 has 8 divisors (see below), whose sum is σ = 2021512776. Its totient is φ = 1347200640.

The previous prime is 1684297357. The next prime is 1684297403. The reversal of 1684297385 is 5837924861.

It can be written as a sum of positive squares in 4 ways, for example, as 38291344 + 1646006041 = 6188^2 + 40571^2 .

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

It is not a de Polignac number, because 1684297385 - 2¹⁶ = 1684231849 is a prime.

It is a super-2 number, since 2×1684297385² = 5673715362235676450, which contains 22 as substring.

It is a Duffinian number.

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, 5327 + ... + 58283.

It is an arithmetic number, because the mean of its divisors is an integer number (252689097).

Almost surely, 2^1684297385 is an apocalyptic number.

It is an amenable number.

1684297385 is a deficient number, since it is larger than the sum of its proper divisors (337215391).

1684297385 is an equidigital number, since it uses as much as digits as its factorization.

1684297385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59323.

The product of its digits is 2903040, while the sum is 53.

The square root of 1684297385 is about 41040.1923119276. The cubic root of 1684297385 is about 1189.7971513574.

The spelling of 1684297385 in words is "one billion, six hundred eighty-four million, two hundred ninety-seven thousand, three hundred eighty-five".