997747799 has 4 divisors (see below), whose sum is σ = 1056438864. Its totient is φ = 939056736.

The previous prime is 997747789. The next prime is 997747811.

It is a happy number.

997747799 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 997747799 - 2⁴ = 997747783 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 (997747769) 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, 29345507 + ... + 29345540.

It is an arithmetic number, because the mean of its divisors is an integer number (264109716).

Almost surely, 2^997747799 is an apocalyptic number.

997747799 is a deficient number, since it is larger than the sum of its proper divisors (58691065).

997747799 is a wasteful number, since it uses less digits than its factorization.

997747799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58691064.

The product of its digits is 63011844, while the sum is 68.

The square root of 997747799 is about 31587.1461040721. The cubic root of 997747799 is about 999.2487020260.

The spelling of 997747799 in words is "nine hundred ninety-seven million, seven hundred forty-seven thousand, seven hundred ninety-nine".