194488689 has 16 divisors (see below), whose sum is σ = 262166528. Its totient is φ = 128241792.

The previous prime is 194488669. The next prime is 194488709. The reversal of 194488689 is 986884491.

It is an interprime number because it is at equal distance from previous prime (194488669) and next prime (194488709).

It is not a de Polignac number, because 194488689 - 2⁷ = 194488561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194488669) 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, 173559 + ... + 174675.

It is an arithmetic number, because the mean of its divisors is an integer number (16385408).

Almost surely, 2^194488689 is an apocalyptic number.

It is an amenable number.

194488689 is a deficient number, since it is larger than the sum of its proper divisors (67677839).

194488689 is a wasteful number, since it uses less digits than its factorization.

194488689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704.

The product of its digits is 3981312, while the sum is 57.

The square root of 194488689 is about 13945.9201560887. The cubic root of 194488689 is about 579.3817123164.

The spelling of 194488689 in words is "one hundred ninety-four million, four hundred eighty-eight thousand, six hundred eighty-nine".