393721061 has 8 divisors (see below), whose sum is σ = 413138880. Its totient is φ = 374494912.

The previous prime is 393721039. The next prime is 393721067. The reversal of 393721061 is 160127393.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-393721061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393721067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43700 + ... + 51933.

It is an arithmetic number, because the mean of its divisors is an integer number (51642360).

Almost surely, 2^393721061 is an apocalyptic number.

It is an amenable number.

393721061 is a deficient number, since it is larger than the sum of its proper divisors (19417819).

393721061 is a wasteful number, since it uses less digits than its factorization.

393721061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95835.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 393721061 is about 19842.4056253268. The cubic root of 393721061 is about 732.9306477667.

The spelling of 393721061 in words is "three hundred ninety-three million, seven hundred twenty-one thousand, sixty-one".