1720997898 has 8 divisors (see below), whose sum is σ = 3441995808. Its totient is φ = 573665964.

The previous prime is 1720997893. The next prime is 1720997899. The reversal of 1720997898 is 8987990271.

It is a sphenic number, since it is the product of 3 distinct primes.

1720997898 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1720997893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143416486 + ... + 143416497.

It is an arithmetic number, because the mean of its divisors is an integer number (430249476).

Almost surely, 2^1720997898 is an apocalyptic number.

1720997898 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1720997898 is a wasteful number, since it uses less digits than its factorization.

1720997898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286832988.

The product of its (nonzero) digits is 4572288, while the sum is 60.

The square root of 1720997898 is about 41484.9116908786. The cubic root of 1720997898 is about 1198.3769487993.

The spelling of 1720997898 in words is "one billion, seven hundred twenty million, nine hundred ninety-seven thousand, eight hundred ninety-eight".