115431540 has 48 divisors (see below), whose sum is σ = 369382272. Its totient is φ = 26384256.

The previous prime is 115431539. The next prime is 115431541. The reversal of 115431540 is 45134511.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (115431539) and next prime (115431541).

It is a self number, because there is not a number n which added to its sum of digits gives 115431540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115431541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136999 + ... + 137838.

It is an arithmetic number, because the mean of its divisors is an integer number (7695464).

Almost surely, 2^115431540 is an apocalyptic number.

115431540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115431540 is an abundant number, since it is smaller than the sum of its proper divisors (253950732).

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

115431540 is a wasteful number, since it uses less digits than its factorization.

115431540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274856 (or 274854 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 115431540 is about 10743.9071105441. The cubic root of 115431540 is about 486.9019306200.

The spelling of 115431540 in words is "one hundred fifteen million, four hundred thirty-one thousand, five hundred forty".