1997331870 has 64 divisors (see below), whose sum is σ = 5342734080. Its totient is φ = 474905088.

The previous prime is 1997331823. The next prime is 1997331899. The reversal of 1997331870 is 781337991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93372 + ... + 112751.

It is an arithmetic number, because the mean of its divisors is an integer number (83480220).

Almost surely, 2^1997331870 is an apocalyptic number.

1997331870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1997331870 is an abundant number, since it is smaller than the sum of its proper divisors (3345402210).

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

1997331870 is a wasteful number, since it uses less digits than its factorization.

1997331870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206169.

The product of its (nonzero) digits is 285768, while the sum is 48.

The square root of 1997331870 is about 44691.5189941000. The cubic root of 1997331870 is about 1259.3605283717.

The spelling of 1997331870 in words is "one billion, nine hundred ninety-seven million, three hundred thirty-one thousand, eight hundred seventy".