147943391 has 4 divisors (see below), whose sum is σ = 148595352. Its totient is φ = 147291432.

The previous prime is 147943381. The next prime is 147943403. The reversal of 147943391 is 193349741.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-147943391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147943331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325640 + ... + 326093.

It is an arithmetic number, because the mean of its divisors is an integer number (37148838).

Almost surely, 2^147943391 is an apocalyptic number.

147943391 is a deficient number, since it is larger than the sum of its proper divisors (651961).

147943391 is an equidigital number, since it uses as much as digits as its factorization.

147943391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651960.

The product of its digits is 81648, while the sum is 41.

The square root of 147943391 is about 12163.1982225071. The cubic root of 147943391 is about 528.8897978114.

The spelling of 147943391 in words is "one hundred forty-seven million, nine hundred forty-three thousand, three hundred ninety-one".