1985926189 has 16 divisors (see below), whose sum is σ = 2262971200. Its totient is φ = 1727640576.

The previous prime is 1985926141. The next prime is 1985926199. The reversal of 1985926189 is 9816295891.

It is a cyclic number.

It is not a de Polignac number, because 1985926189 - 2¹¹ = 1985924141 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 (1985926199) 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, 26842 + ... + 68500.

It is an arithmetic number, because the mean of its divisors is an integer number (141435700).

Almost surely, 2^1985926189 is an apocalyptic number.

1985926189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1985926189 is a deficient number, since it is larger than the sum of its proper divisors (277045011).

1985926189 is a wasteful number, since it uses less digits than its factorization.

1985926189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41884.

The product of its digits is 2799360, while the sum is 58.

The square root of 1985926189 is about 44563.7317669874. The cubic root of 1985926189 is about 1256.9587754539.

The spelling of 1985926189 in words is "one billion, nine hundred eighty-five million, nine hundred twenty-six thousand, one hundred eighty-nine".