121947795 has 32 divisors (see below), whose sum is σ = 228211200. Its totient is φ = 61614432.

The previous prime is 121947779. The next prime is 121947799. The reversal of 121947795 is 597749121.

It is not a de Polignac number, because 121947795 - 2⁴ = 121947779 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 121947795.

It is not an unprimeable number, because it can be changed into a prime (121947799) 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 31 ways as a sum of consecutive naturals, for example, 21207 + ... + 26336.

It is an arithmetic number, because the mean of its divisors is an integer number (7131600).

Almost surely, 2^121947795 is an apocalyptic number.

121947795 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121947795 is a deficient number, since it is larger than the sum of its proper divisors (106263405).

121947795 is a wasteful number, since it uses less digits than its factorization.

121947795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47576 (or 47570 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The square root of 121947795 is about 11042.9975550120. The cubic root of 121947795 is about 495.8968131579.

The spelling of 121947795 in words is "one hundred twenty-one million, nine hundred forty-seven thousand, seven hundred ninety-five".