1997748963 has 72 divisors (see below), whose sum is σ = 3453871200. Its totient is φ = 1111955040.

The previous prime is 1997748953. The next prime is 1997749021. The reversal of 1997748963 is 3698477991.

1997748963 is a `hidden beast` number, since 1 + 9 + 97 + 7 + 489 + 63 = 666.

It is not a de Polignac number, because 1997748963 - 2⁸ = 1997748707 is a prime.

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

Its product of digits (20575296) is a multiple of the sum of its prime factors (294).

It is a self number, because there is not a number n which added to its sum of digits gives 1997748963.

It is not an unprimeable number, because it can be changed into a prime (1997748923) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 19395570 + ... + 19395672.

Almost surely, 2^1997748963 is an apocalyptic number.

1997748963 is a deficient number, since it is larger than the sum of its proper divisors (1456122237).

1997748963 is an equidigital number, since it uses as much as digits as its factorization.

1997748963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 174 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 1997748963 is about 44696.1851056665. The cubic root of 1997748963 is about 1259.4481842941.

The spelling of 1997748963 in words is "one billion, nine hundred ninety-seven million, seven hundred forty-eight thousand, nine hundred sixty-three".