199091385 has 16 divisors (see below), whose sum is σ = 353940480. Its totient is φ = 106182000.

The previous prime is 199091383. The next prime is 199091401. The reversal of 199091385 is 583190991.

It is not a de Polignac number, because 199091385 - 2¹ = 199091383 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 199091385.

It is not an unprimeable number, because it can be changed into a prime (199091383) 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, 737241 + ... + 737510.

It is an arithmetic number, because the mean of its divisors is an integer number (22121280).

Almost surely, 2^199091385 is an apocalyptic number.

199091385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199091385 is a deficient number, since it is larger than the sum of its proper divisors (154849095).

199091385 is a wasteful number, since it uses less digits than its factorization.

199091385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474765 (or 1474759 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 199091385 is about 14109.9746633366. The cubic root of 199091385 is about 583.9166010027.

The spelling of 199091385 in words is "one hundred ninety-nine million, ninety-one thousand, three hundred eighty-five".