117721827 has 24 divisors (see below), whose sum is σ = 175243536. Its totient is φ = 76095936.

The previous prime is 117721823. The next prime is 117721837. The reversal of 117721827 is 728127711.

It is not a de Polignac number, because 117721827 - 2² = 117721823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 117721791 and 117721800.

It is not an unprimeable number, because it can be changed into a prime (117721823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155133 + ... + 155889.

It is an arithmetic number, because the mean of its divisors is an integer number (7301814).

Almost surely, 2^117721827 is an apocalyptic number.

117721827 is a deficient number, since it is larger than the sum of its proper divisors (57521709).

117721827 is a wasteful number, since it uses less digits than its factorization.

117721827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267 (or 1264 counting only the distinct ones).

The product of its digits is 10976, while the sum is 36.

The square root of 117721827 is about 10849.9689861308. The cubic root of 117721827 is about 490.1010856283.

The spelling of 117721827 in words is "one hundred seventeen million, seven hundred twenty-one thousand, eight hundred twenty-seven".