671438 has 4 divisors (see below), whose sum is σ = 1007160. Its totient is φ = 335718.

The previous prime is 671431. The next prime is 671443. The reversal of 671438 is 834176.

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

It is a Curzon number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 671438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671431) by changing a digit.

671438 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167858 + ... + 167861.

It is an arithmetic number, because the mean of its divisors is an integer number (251790).

2⁶⁷¹⁴³⁸ is an apocalyptic number.

671438 is a deficient number, since it is larger than the sum of its proper divisors (335722).

671438 is a wasteful number, since it uses less digits than its factorization.

671438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335721.

The product of its digits is 4032, while the sum is 29.

The square root of 671438 is about 819.4132046776. The cubic root of 671438 is about 87.5659584306.

The spelling of 671438 in words is "six hundred seventy-one thousand, four hundred thirty-eight".