117887381 has 16 divisors (see below), whose sum is σ = 127659840. Its totient is φ = 108501120.

The previous prime is 117887377. The next prime is 117887417. The reversal of 117887381 is 183788711.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 117887381 - 2² = 117887377 is a prime.

It is a super-2 number, since 2×117887381² = 27794869198078322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117887321) 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, 255491 + ... + 255951.

It is an arithmetic number, because the mean of its divisors is an integer number (7978740).

Almost surely, 2^117887381 is an apocalyptic number.

It is an amenable number.

117887381 is a deficient number, since it is larger than the sum of its proper divisors (9772459).

117887381 is a wasteful number, since it uses less digits than its factorization.

117887381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836.

The product of its digits is 75264, while the sum is 44.

The square root of 117887381 is about 10857.5955441341. The cubic root of 117887381 is about 490.3307235569.

The spelling of 117887381 in words is "one hundred seventeen million, eight hundred eighty-seven thousand, three hundred eighty-one".