393256661 has 32 divisors (see below), whose sum is σ = 492687360. Its totient is φ = 306386496.

The previous prime is 393256657. The next prime is 393256663. The reversal of 393256661 is 166652393.

It is a cyclic number.

It is not a de Polignac number, because 393256661 - 2² = 393256657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393256663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 330710 + ... + 331896.

It is an arithmetic number, because the mean of its divisors is an integer number (15396480).

Almost surely, 2^393256661 is an apocalyptic number.

It is an amenable number.

393256661 is a deficient number, since it is larger than the sum of its proper divisors (99430699).

393256661 is a wasteful number, since it uses less digits than its factorization.

393256661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313.

The product of its digits is 174960, while the sum is 41.

The square root of 393256661 is about 19830.6999624320. The cubic root of 393256661 is about 732.6423667649.

The spelling of 393256661 in words is "three hundred ninety-three million, two hundred fifty-six thousand, six hundred sixty-one".