117981787 has 8 divisors (see below), whose sum is σ = 147094272. Its totient is φ = 91933800.

The previous prime is 117981781. The next prime is 117981823. The reversal of 117981787 is 787189711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 117981787 - 2¹⁵ = 117949019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117981787.

It is not an unprimeable number, because it can be changed into a prime (117981781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 766039 + ... + 766192.

It is an arithmetic number, because the mean of its divisors is an integer number (18386784).

Almost surely, 2^117981787 is an apocalyptic number.

117981787 is a deficient number, since it is larger than the sum of its proper divisors (29112485).

117981787 is a wasteful number, since it uses less digits than its factorization.

117981787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532249.

The product of its digits is 197568, while the sum is 49.

The square root of 117981787 is about 10861.9421375737. The cubic root of 117981787 is about 490.4615767231.

The spelling of 117981787 in words is "one hundred seventeen million, nine hundred eighty-one thousand, seven hundred eighty-seven".