385520691 has 8 divisors (see below), whose sum is σ = 522740160. Its totient is φ = 252657512.

The previous prime is 385520651. The next prime is 385520719. The reversal of 385520691 is 196025583.

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

It is a cyclic number.

It is not a de Polignac number, because 385520691 - 2⁶ = 385520627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (385520651) 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, 1088865 + ... + 1089218.

It is an arithmetic number, because the mean of its divisors is an integer number (65342520).

Almost surely, 2^385520691 is an apocalyptic number.

385520691 is a deficient number, since it is larger than the sum of its proper divisors (137219469).

385520691 is a wasteful number, since it uses less digits than its factorization.

385520691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178145.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 385520691 is about 19634.6808224631. The cubic root of 385520691 is about 727.8064452179.

The spelling of 385520691 in words is "three hundred eighty-five million, five hundred twenty thousand, six hundred ninety-one".