147338721 has 6 divisors (see below), whose sum is σ = 212822610. Its totient is φ = 98225808.

The previous prime is 147338717. The next prime is 147338731. The reversal of 147338721 is 127833741.

It can be written as a sum of positive squares in only one way, i.e., 134096400 + 13242321 = 11580^2 + 3639^2 .

It is not a de Polignac number, because 147338721 - 2² = 147338717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (147338701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8185476 + ... + 8185493.

It is an arithmetic number, because the mean of its divisors is an integer number (35470435).

Almost surely, 2^147338721 is an apocalyptic number.

It is an amenable number.

147338721 is a deficient number, since it is larger than the sum of its proper divisors (65483889).

147338721 is a wasteful number, since it uses less digits than its factorization.

147338721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16370975 (or 16370972 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 147338721 is about 12138.3162341405. The cubic root of 147338721 is about 528.1682594771.

The spelling of 147338721 in words is "one hundred forty-seven million, three hundred thirty-eight thousand, seven hundred twenty-one".