117742387 has 4 divisors (see below), whose sum is σ = 134562736. Its totient is φ = 100922040.

The previous prime is 117742381. The next prime is 117742409. The reversal of 117742387 is 783247711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 783247711 = 12821 ⋅61091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117742387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117742381) 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 3 ways as a sum of consecutive naturals, for example, 8410164 + ... + 8410177.

It is an arithmetic number, because the mean of its divisors is an integer number (33640684).

Almost surely, 2^117742387 is an apocalyptic number.

117742387 is a deficient number, since it is larger than the sum of its proper divisors (16820349).

117742387 is an equidigital number, since it uses as much as digits as its factorization.

117742387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16820348.

The product of its digits is 65856, while the sum is 40.

The square root of 117742387 is about 10850.9164129119. The cubic root of 117742387 is about 490.1296158565.

It can be divided in two parts, 11774 and 2387, that added together give a square (14161 = 119²).

The spelling of 117742387 in words is "one hundred seventeen million, seven hundred forty-two thousand, three hundred eighty-seven".