115821705 has 16 divisors (see below), whose sum is σ = 185492160. Its totient is φ = 61712448.

The previous prime is 115821703. The next prime is 115821707. The reversal of 115821705 is 507128511.

It is an interprime number because it is at equal distance from previous prime (115821703) and next prime (115821707).

It is not a de Polignac number, because 115821705 - 2¹ = 115821703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115821703) 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, 15819 + ... + 21951.

It is an arithmetic number, because the mean of its divisors is an integer number (11593260).

Almost surely, 2^115821705 is an apocalyptic number.

115821705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

115821705 is a deficient number, since it is larger than the sum of its proper divisors (69670455).

115821705 is a wasteful number, since it uses less digits than its factorization.

115821705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7400.

The product of its (nonzero) digits is 2800, while the sum is 30.

The square root of 115821705 is about 10762.0492936987. The cubic root of 115821705 is about 487.4498988617.

The spelling of 115821705 in words is "one hundred fifteen million, eight hundred twenty-one thousand, seven hundred five".