671399 has 4 divisors (see below), whose sum is σ = 673536. Its totient is φ = 669264.

The previous prime is 671383. The next prime is 671401. The reversal of 671399 is 993176.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 671399 - 2⁴ = 671383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 671399.

It is not an unprimeable number, because it can be changed into a prime (671339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494 + ... + 1259.

It is an arithmetic number, because the mean of its divisors is an integer number (168384).

2⁶⁷¹³⁹⁹ is an apocalyptic number.

671399 is a deficient number, since it is larger than the sum of its proper divisors (2137).

671399 is a wasteful number, since it uses less digits than its factorization.

671399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136.

The product of its digits is 10206, while the sum is 35.

The square root of 671399 is about 819.3894068146. The cubic root of 671399 is about 87.5642629956.

The spelling of 671399 in words is "six hundred seventy-one thousand, three hundred ninety-nine".