99997905 has 64 divisors (see below), whose sum is σ = 195084288. Its totient is φ = 42746880.

The previous prime is 99997901. The next prime is 99997907. The reversal of 99997905 is 50979999.

It is not a de Polignac number, because 99997905 - 2² = 99997901 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99997901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 113065 + ... + 113945.

It is an arithmetic number, because the mean of its divisors is an integer number (3048192).

Almost surely, 2^99997905 is an apocalyptic number.

It is an amenable number.

99997905 is a deficient number, since it is larger than the sum of its proper divisors (95086383).

99997905 is a wasteful number, since it uses less digits than its factorization.

99997905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966.

The product of its (nonzero) digits is 2066715, while the sum is 57.

The square root of 99997905 is about 9999.8952494514. The cubic root of 99997905 is about 464.1556419624.

The spelling of 99997905 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred five".