1797747997 has 4 divisors (see below), whose sum is σ = 1802442240. Its totient is φ = 1793053756.

The previous prime is 1797747983. The next prime is 1797748003. The reversal of 1797747997 is 7997477971.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1797747997 - 2¹¹ = 1797745949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1797747967) 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, 2346547 + ... + 2347312.

It is an arithmetic number, because the mean of its divisors is an integer number (450610560).

Almost surely, 2^1797747997 is an apocalyptic number.

It is an amenable number.

1797747997 is a deficient number, since it is larger than the sum of its proper divisors (4694243).

1797747997 is an equidigital number, since it uses as much as digits as its factorization.

1797747997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4694242.

The product of its digits is 49009212, while the sum is 67.

The square root of 1797747997 is about 42399.8584549524. The cubic root of 1797747997 is about 1215.9328860282.

The spelling of 1797747997 in words is "one billion, seven hundred ninety-seven million, seven hundred forty-seven thousand, nine hundred ninety-seven".