147905 has 4 divisors (see below), whose sum is σ = 177492. Its totient is φ = 118320.

The previous prime is 147881. The next prime is 147919. The reversal of 147905 is 509741.

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

It can be written as a sum of positive squares in 2 ways, for example, as 82369 + 65536 = 287^2 + 256^2 .

It is a de Polignac number, because none of the positive numbers 2^k-147905 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 147905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14786 + ... + 14795.

It is an arithmetic number, because the mean of its divisors is an integer number (44373).

147905 is a Friedman number, since it can be written as 9*(50+4^7)-1, using all its digits and the basic arithmetic operations.

2¹⁴⁷⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

147905 is a deficient number, since it is larger than the sum of its proper divisors (29587).

147905 is an equidigital number, since it uses as much as digits as its factorization.

147905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29586.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 147905 is about 384.5841910427. The cubic root of 147905 is about 52.8844045255.

The spelling of 147905 in words is "one hundred forty-seven thousand, nine hundred five".