997949799 has 144 divisors (see below), whose sum is σ = 1933381632. Its totient is φ = 484704000.

The previous prime is 997949683. The next prime is 997949807.

997949799 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 997949799 - 2²³ = 989561191 is a prime.

Its product of digits (104162436) is a multiple of the sum of its prime divisors (196).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997949399) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 9688782 + ... + 9688884.

Almost surely, 2^997949799 is an apocalyptic number.

997949799 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

997949799 is a deficient number, since it is larger than the sum of its proper divisors (935431833).

997949799 is a wasteful number, since it uses less digits than its factorization.

997949799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 196 counting only the distinct ones).

The product of its digits is 104162436, while the sum is 72.

The square root of 997949799 is about 31590.3434454265. The cubic root of 997949799 is about 999.3161320980.

The spelling of 997949799 in words is "nine hundred ninety-seven million, nine hundred forty-nine thousand, seven hundred ninety-nine".