1997499960 has 128 divisors (see below), whose sum is σ = 6703560000. Its totient is φ = 529049088.

The previous prime is 1997499947. The next prime is 1997499979. The reversal of 1997499960 is 699947991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154714 + ... + 167126.

Almost surely, 2^1997499960 is an apocalyptic number.

1997499960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997499960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3351780000).

1997499960 is an abundant number, since it is smaller than the sum of its proper divisors (4706060040).

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

1997499960 is a wasteful number, since it uses less digits than its factorization.

1997499960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12582 (or 12572 counting only the distinct ones).

The product of its (nonzero) digits is 9920232, while the sum is 63.

The square root of 1997499960 is about 44693.3995126797. The cubic root of 1997499960 is about 1259.3958554959.

The spelling of 1997499960 in words is "one billion, nine hundred ninety-seven million, four hundred ninety-nine thousand, nine hundred sixty".