1997915760 has 80 divisors (see below), whose sum is σ = 6881717280. Its totient is φ = 532776960.

The previous prime is 1997915753. The next prime is 1997915831. The reversal of 1997915760 is 675197991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1997915697 and 1997915706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460321 + ... + 464640.

It is an arithmetic number, because the mean of its divisors is an integer number (86021466).

Almost surely, 2^1997915760 is an apocalyptic number.

1997915760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1997915760 is an abundant number, since it is smaller than the sum of its proper divisors (4883801520).

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

1997915760 is a wasteful number, since it uses less digits than its factorization.

1997915760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924983 (or 924971 counting only the distinct ones).

The product of its (nonzero) digits is 1071630, while the sum is 54.

The square root of 1997915760 is about 44698.0509642199. The cubic root of 1997915760 is about 1259.4832347995.

The spelling of 1997915760 in words is "one billion, nine hundred ninety-seven million, nine hundred fifteen thousand, seven hundred sixty".