1997895845 has 32 divisors (see below), whose sum is σ = 2844170496. Its totient is φ = 1330560000.

The previous prime is 1997895833. The next prime is 1997895857. The reversal of 1997895845 is 5485987991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1997895833) and next prime (1997895857).

It is a de Polignac number, because none of the positive numbers 2^k-1997895845 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5720 + ... + 63470.

It is an arithmetic number, because the mean of its divisors is an integer number (88880328).

Almost surely, 2^1997895845 is an apocalyptic number.

It is an amenable number.

1997895845 is a deficient number, since it is larger than the sum of its proper divisors (846274651).

1997895845 is a wasteful number, since it uses less digits than its factorization.

1997895845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57821.

The product of its digits is 32659200, while the sum is 65.

The square root of 1997895845 is about 44697.8281910878. The cubic root of 1997895845 is about 1259.4790499898.

The spelling of 1997895845 in words is "one billion, nine hundred ninety-seven million, eight hundred ninety-five thousand, eight hundred forty-five".