115785840 has 40 divisors (see below), whose sum is σ = 358936848. Its totient is φ = 30876160.

The previous prime is 115785833. The next prime is 115785847. The reversal of 115785840 is 48587511.

It is an interprime number because it is at equal distance from previous prime (115785833) and next prime (115785847).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115785847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240981 + ... + 241460.

Almost surely, 2^115785840 is an apocalyptic number.

115785840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115785840 is an abundant number, since it is smaller than the sum of its proper divisors (243151008).

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

115785840 is a wasteful number, since it uses less digits than its factorization.

115785840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482457 (or 482451 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 39.

The square root of 115785840 is about 10760.3828928157. The cubic root of 115785840 is about 487.3995795787.

The spelling of 115785840 in words is "one hundred fifteen million, seven hundred eighty-five thousand, eight hundred forty".