99997965 has 12 divisors (see below), whose sum is σ = 173329884. Its totient is φ = 53332224.

The previous prime is 99997957. The next prime is 99997973. The reversal of 99997965 is 56979999.

It is an interprime number because it is at equal distance from previous prime (99997957) and next prime (99997973).

It can be written as a sum of positive squares in 2 ways, for example, as 45400644 + 54597321 = 6738^2 + 7389^2 .

It is not a de Polignac number, because 99997965 - 2³ = 99997957 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1111044 + ... + 1111133.

It is an arithmetic number, because the mean of its divisors is an integer number (14444157).

Almost surely, 2^99997965 is an apocalyptic number.

It is an amenable number.

99997965 is a deficient number, since it is larger than the sum of its proper divisors (73331919).

99997965 is a wasteful number, since it uses less digits than its factorization.

99997965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222188 (or 2222185 counting only the distinct ones).

The product of its digits is 12400290, while the sum is 63.

The square root of 99997965 is about 9999.8982494823. The cubic root of 99997965 is about 464.1557347955.

The spelling of 99997965 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred sixty-five".