1897986385 has 8 divisors (see below), whose sum is σ = 2311577856. Its totient is φ = 1495726320.

The previous prime is 1897986379. The next prime is 1897986397. The reversal of 1897986385 is 5836897981.

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

It is not a de Polignac number, because 1897986385 - 2⁵ = 1897986353 is a prime.

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, 2832481 + ... + 2833150.

It is an arithmetic number, because the mean of its divisors is an integer number (288947232).

Almost surely, 2^1897986385 is an apocalyptic number.

It is an amenable number.

1897986385 is a deficient number, since it is larger than the sum of its proper divisors (413591471).

1897986385 is an equidigital number, since it uses as much as digits as its factorization.

1897986385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5665703.

The product of its digits is 26127360, while the sum is 64.

The square root of 1897986385 is about 43565.8855642807. The cubic root of 1897986385 is about 1238.1246332714.

The spelling of 1897986385 in words is "one billion, eight hundred ninety-seven million, nine hundred eighty-six thousand, three hundred eighty-five".