1997846865 has 144 divisors (see below), whose sum is σ = 4342852800. Its totient is φ = 844349184.

The previous prime is 1997846839. The next prime is 1997846881. The reversal of 1997846865 is 5686487991.

It is not a de Polignac number, because 1997846865 - 2¹⁴ = 1997830481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1800931 + ... + 1802039.

It is an arithmetic number, because the mean of its divisors is an integer number (30158700).

Almost surely, 2^1997846865 is an apocalyptic number.

1997846865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1997846865 is an abundant number, since it is smaller than the sum of its proper divisors (2345005935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1997846865 is a wasteful number, since it uses less digits than its factorization.

1997846865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196 (or 1186 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The square root of 1997846865 is about 44697.2802863888. The cubic root of 1997846865 is about 1259.4687575300.

The spelling of 1997846865 in words is "one billion, nine hundred ninety-seven million, eight hundred forty-six thousand, eight hundred sixty-five".