997724893 has 8 divisors (see below), whose sum is σ = 1088664480. Its totient is φ = 906824880.

The previous prime is 997724881. The next prime is 997724911. The reversal of 997724893 is 398427799.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997724893 is a prime.

It is a super-2 number, since 2×997724893² = 1990909924223722898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997724813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73246 + ... + 85792.

It is an arithmetic number, because the mean of its divisors is an integer number (136083060).

Almost surely, 2^997724893 is an apocalyptic number.

It is an amenable number.

997724893 is a deficient number, since it is larger than the sum of its proper divisors (90939587).

997724893 is a wasteful number, since it uses less digits than its factorization.

997724893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19787.

The product of its digits is 6858432, while the sum is 58.

The square root of 997724893 is about 31586.7835177943. The cubic root of 997724893 is about 999.2410551484.

The spelling of 997724893 in words is "nine hundred ninety-seven million, seven hundred twenty-four thousand, eight hundred ninety-three".