194721 has 8 divisors (see below), whose sum is σ = 265344. Its totient is φ = 126960.

The previous prime is 194717. The next prime is 194723. The reversal of 194721 is 127491.

194721 = T₁₃₈ + T₁₃₉ + ... + T₁₅₅.

194721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 194721 - 2² = 194717 is a prime.

194721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 194691 and 194700.

It is not an unprimeable number, because it can be changed into a prime (194723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550 + ... + 831.

It is an arithmetic number, because the mean of its divisors is an integer number (33168).

2¹⁹⁴⁷²¹ is an apocalyptic number.

It is an amenable number.

194721 is a deficient number, since it is larger than the sum of its proper divisors (70623).

194721 is a wasteful number, since it uses less digits than its factorization.

194721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431.

The product of its digits is 504, while the sum is 24.

The square root of 194721 is about 441.2720249461. The cubic root of 194721 is about 57.9612305315.

The spelling of 194721 in words is "one hundred ninety-four thousand, seven hundred twenty-one".