146721 has 4 divisors (see below), whose sum is σ = 195632. Its totient is φ = 97812.

The previous prime is 146719. The next prime is 146743. The reversal of 146721 is 127641.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 146721 - 2¹ = 146719 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146701) 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, 24451 + ... + 24456.

It is an arithmetic number, because the mean of its divisors is an integer number (48908).

2¹⁴⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

146721 is a deficient number, since it is larger than the sum of its proper divisors (48911).

146721 is an equidigital number, since it uses as much as digits as its factorization.

146721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48910.

The product of its digits is 336, while the sum is 21.

The square root of 146721 is about 383.0417731789. The cubic root of 146721 is about 52.7429106321.

The spelling of 146721 in words is "one hundred forty-six thousand, seven hundred twenty-one".