99897797 has 16 divisors (see below), whose sum is σ = 108501120. Its totient is φ = 91627008.

The previous prime is 99897773. The next prime is 99897881. The reversal of 99897797 is 79779899.

It is not a de Polignac number, because 99897797 - 2¹⁰ = 99896773 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 (99897727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137048 + ... + 137774.

It is an arithmetic number, because the mean of its divisors is an integer number (6781320).

Almost surely, 2^99897797 is an apocalyptic number.

It is an amenable number.

99897797 is a deficient number, since it is larger than the sum of its proper divisors (8603323).

99897797 is a wasteful number, since it uses less digits than its factorization.

99897797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940.

The product of its digits is 18003384, while the sum is 65.

The square root of 99897797 is about 9994.8885436507. Note that the first 3 decimals coincide. The cubic root of 99897797 is about 464.0007013589. Note that the first 3 decimals are identical.

It can be divided in two parts, 998 and 97797, that multiplied together give a triangular number (97601406 = T₁₃₉₇₁).

The spelling of 99897797 in words is "ninety-nine million, eight hundred ninety-seven thousand, seven hundred ninety-seven".