147721 has 8 divisors (see below), whose sum is σ = 172800. Its totient is φ = 123648.

The previous prime is 147709. The next prime is 147727. The reversal of 147721 is 127741.

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

It is not a de Polignac number, because 147721 - 2⁵ = 147689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 147692 and 147701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (21600).

2¹⁴⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

147721 is a deficient number, since it is larger than the sum of its proper divisors (25079).

147721 is an equidigital number, since it uses as much as digits as its factorization.

147721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503.

The product of its digits is 392, while the sum is 22.

The square root of 147721 is about 384.3448971952. The cubic root of 147721 is about 52.8624652889.

It can be divided in two parts, 147 and 721, that added together give a palindrome (868).

The spelling of 147721 in words is "one hundred forty-seven thousand, seven hundred twenty-one", and thus it is an iban number.