671398 has 48 divisors (see below), whose sum is σ = 1378944. Its totient is φ = 241920.

The previous prime is 671383. The next prime is 671401. The reversal of 671398 is 893176.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21643 + ... + 21673.

It is an arithmetic number, because the mean of its divisors is an integer number (28728).

2⁶⁷¹³⁹⁸ is an apocalyptic number.

671398 is an abundant number, since it is smaller than the sum of its proper divisors (707546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671398 is a wasteful number, since it uses less digits than its factorization.

671398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 70 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 671398 is about 819.3887966039. The cubic root of 671398 is about 87.5642195220.

The spelling of 671398 in words is "six hundred seventy-one thousand, three hundred ninety-eight".