1997038320 has 80 divisors (see below), whose sum is σ = 6516666240. Its totient is φ = 504513792.

The previous prime is 1997038283. The next prime is 1997038361. The reversal of 1997038320 is 238307991.

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

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, 214414 + ... + 223533.

It is an arithmetic number, because the mean of its divisors is an integer number (81458328).

Almost surely, 2^1997038320 is an apocalyptic number.

1997038320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1997038320 is an abundant number, since it is smaller than the sum of its proper divisors (4519627920).

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

1997038320 is a wasteful number, since it uses less digits than its factorization.

1997038320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437982 (or 437976 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 1997038320 is about 44688.2346932613. The cubic root of 1997038320 is about 1259.2988288279.

The spelling of 1997038320 in words is "one billion, nine hundred ninety-seven million, thirty-eight thousand, three hundred twenty".