385987191 has 4 divisors (see below), whose sum is σ = 514649592. Its totient is φ = 257324792.

The previous prime is 385987157. The next prime is 385987207. The reversal of 385987191 is 191789583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191789583 = 3 ⋅63929861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385987191 is a prime.

It is a super-2 number, since 2×385987191² = 297972223232140962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385987141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64331196 + ... + 64331201.

It is an arithmetic number, because the mean of its divisors is an integer number (128662398).

Almost surely, 2^385987191 is an apocalyptic number.

385987191 is a deficient number, since it is larger than the sum of its proper divisors (128662401).

385987191 is a wasteful number, since it uses less digits than its factorization.

385987191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128662400.

The product of its digits is 544320, while the sum is 51.

The square root of 385987191 is about 19646.5567212171. The cubic root of 385987191 is about 728.0998880519.

The spelling of 385987191 in words is "three hundred eighty-five million, nine hundred eighty-seven thousand, one hundred ninety-one".