997871705 has 8 divisors (see below), whose sum is σ = 1197890952. Its totient is φ = 798000768.

The previous prime is 997871683. The next prime is 997871713. The reversal of 997871705 is 507178799.

It can be written as a sum of positive squares in 4 ways, for example, as 522762496 + 475109209 = 22864^2 + 21797^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 997871705 - 2²⁰ = 996823129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21692 + ... + 49661.

It is an arithmetic number, because the mean of its divisors is an integer number (149736369).

Almost surely, 2^997871705 is an apocalyptic number.

It is an amenable number.

997871705 is a deficient number, since it is larger than the sum of its proper divisors (200019247).

997871705 is a wasteful number, since it uses less digits than its factorization.

997871705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74155.

The product of its (nonzero) digits is 1111320, while the sum is 53.

The square root of 997871705 is about 31589.1073789685. The cubic root of 997871705 is about 999.2900644441.

The spelling of 997871705 in words is "nine hundred ninety-seven million, eight hundred seventy-one thousand, seven hundred five".