121782147 has 8 divisors (see below), whose sum is σ = 162438144. Its totient is φ = 81157128.

The previous prime is 121782137. The next prime is 121782151. The reversal of 121782147 is 741287121.

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

It is not a de Polignac number, because 121782147 - 2⁶ = 121782083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121782137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3958 + ... + 16100.

It is an arithmetic number, because the mean of its divisors is an integer number (20304768).

Almost surely, 2^121782147 is an apocalyptic number.

121782147 is a deficient number, since it is larger than the sum of its proper divisors (40655997).

121782147 is a wasteful number, since it uses less digits than its factorization.

121782147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15489.

The product of its digits is 6272, while the sum is 33.

The square root of 121782147 is about 11035.4948688312. The cubic root of 121782147 is about 495.6721773154.

The spelling of 121782147 in words is "one hundred twenty-one million, seven hundred eighty-two thousand, one hundred forty-seven".