671840389 has 8 divisors (see below), whose sum is σ = 742957632. Its totient is φ = 602396640.

The previous prime is 671840387. The next prime is 671840467. The reversal of 671840389 is 983048176.

It is a happy number.

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 671840389 - 2¹ = 671840387 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 (671840381) 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, 417529 + ... + 419134.

It is an arithmetic number, because the mean of its divisors is an integer number (92869704).

Almost surely, 2^671840389 is an apocalyptic number.

It is an amenable number.

671840389 is a deficient number, since it is larger than the sum of its proper divisors (71117243).

671840389 is a wasteful number, since it uses less digits than its factorization.

671840389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836747.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 671840389 is about 25919.8840468085. The cubic root of 671840389 is about 875.8344753209.

The spelling of 671840389 in words is "six hundred seventy-one million, eight hundred forty thousand, three hundred eighty-nine".