385947661 has 16 divisors (see below), whose sum is σ = 432875520. Its totient is φ = 341071920.

The previous prime is 385947647. The next prime is 385947677. The reversal of 385947661 is 166749583.

It is a cyclic number.

It is not a de Polignac number, because 385947661 - 2¹³ = 385939469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385947641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103650 + ... + 107308.

It is an arithmetic number, because the mean of its divisors is an integer number (27054720).

Almost surely, 2^385947661 is an apocalyptic number.

It is an amenable number.

385947661 is a deficient number, since it is larger than the sum of its proper divisors (46927859).

385947661 is a wasteful number, since it uses less digits than its factorization.

385947661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936.

The product of its digits is 1088640, while the sum is 49.

The square root of 385947661 is about 19645.5506667540. The cubic root of 385947661 is about 728.0750316388.

The spelling of 385947661 in words is "three hundred eighty-five million, nine hundred forty-seven thousand, six hundred sixty-one".