115211540 has 24 divisors (see below), whose sum is σ = 243690720. Its totient is φ = 45751968.

The previous prime is 115211539. The next prime is 115211549. The reversal of 115211540 is 45112511.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115211549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17942 + ... + 23501.

It is an arithmetic number, because the mean of its divisors is an integer number (10153780).

Almost surely, 2^115211540 is an apocalyptic number.

115211540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115211540 is an abundant number, since it is smaller than the sum of its proper divisors (128479180).

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

115211540 is a wasteful number, since it uses less digits than its factorization.

115211540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41591 (or 41589 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 115211540 is about 10733.6638665462. The cubic root of 115211540 is about 486.5924064670.

The spelling of 115211540 in words is "one hundred fifteen million, two hundred eleven thousand, five hundred forty".