115851405 has 16 divisors (see below), whose sum is σ = 185814720. Its totient is φ = 61636608.

The previous prime is 115851377. The next prime is 115851409. The reversal of 115851405 is 504158511.

It is not a de Polignac number, because 115851405 - 2⁸ = 115851149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115851409) 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, 2932 + ... + 15501.

It is an arithmetic number, because the mean of its divisors is an integer number (11613420).

Almost surely, 2^115851405 is an apocalyptic number.

115851405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

115851405 is a deficient number, since it is larger than the sum of its proper divisors (69963315).

115851405 is a wasteful number, since it uses less digits than its factorization.

115851405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18860.

The product of its (nonzero) digits is 4000, while the sum is 30.

The square root of 115851405 is about 10763.4290539772. The cubic root of 115851405 is about 487.4915606692.

The spelling of 115851405 in words is "one hundred fifteen million, eight hundred fifty-one thousand, four hundred five".