671846399 has 18 divisors (see below), whose sum is σ = 817024320. Its totient is φ = 550809336.

The previous prime is 671846389. The next prime is 671846411. The reversal of 671846399 is 993648176.

It is a Cunningham number, because it is equal to 25920²-1.

It is not a de Polignac number, because 671846399 - 2⁸ = 671846143 is a prime.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 671846399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671846389) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12962 + ... + 38880.

It is an arithmetic number, because the mean of its divisors is an integer number (45390240).

Almost surely, 2^671846399 is an apocalyptic number.

671846399 is a deficient number, since it is larger than the sum of its proper divisors (145177921).

671846399 is a wasteful number, since it uses less digits than its factorization.

671846399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25979 (or 25949 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 53.

The square root of 671846399 is about 25919.9999807099. Note that the first 4 decimals coincide. The cubic root of 671846399 is about 875.8370869280.

The spelling of 671846399 in words is "six hundred seventy-one million, eight hundred forty-six thousand, three hundred ninety-nine".