115661392 has 80 divisors (see below), whose sum is σ = 281232000. Its totient is φ = 44766720.

The previous prime is 115661389. The next prime is 115661393. The reversal of 115661392 is 293166511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115661393) 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, 331234 + ... + 331582.

It is an arithmetic number, because the mean of its divisors is an integer number (3515400).

Almost surely, 2^115661392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 115661392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140616000).

115661392 is an abundant number, since it is smaller than the sum of its proper divisors (165570608).

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

115661392 is a wasteful number, since it uses less digits than its factorization.

115661392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 638 counting only the distinct ones).

The product of its digits is 9720, while the sum is 34.

The square root of 115661392 is about 10754.5986443010. The cubic root of 115661392 is about 487.2248960219.

The spelling of 115661392 in words is "one hundred fifteen million, six hundred sixty-one thousand, three hundred ninety-two".