115771840 has 28 divisors (see below), whose sum is σ = 275682456. Its totient is φ = 46308608.

The previous prime is 115771829. The next prime is 115771847. The reversal of 115771840 is 48177511.

It is a junction number, because it is equal to n+sod(n) for n = 115771796 and 115771805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115771847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180574 + ... + 181213.

It is an arithmetic number, because the mean of its divisors is an integer number (9845802).

Almost surely, 2^115771840 is an apocalyptic number.

115771840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115771840 is an abundant number, since it is smaller than the sum of its proper divisors (159910616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

115771840 is an equidigital number, since it uses as much as digits as its factorization.

115771840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361804 (or 361794 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 34.

The square root of 115771840 is about 10759.7323386783. The cubic root of 115771840 is about 487.3799344904.

It can be divided in two parts, 115771 and 840, that added together give a palindrome (116611).

The spelling of 115771840 in words is "one hundred fifteen million, seven hundred seventy-one thousand, eight hundred forty".