671387 has 4 divisors (see below), whose sum is σ = 679560. Its totient is φ = 663216.

The previous prime is 671383. The next prime is 671401. The reversal of 671387 is 783176.

It is a happy number.

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 671387 - 2² = 671383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671383) 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, 3962 + ... + 4127.

It is an arithmetic number, because the mean of its divisors is an integer number (169890).

2⁶⁷¹³⁸⁷ is an apocalyptic number.

671387 is a deficient number, since it is larger than the sum of its proper divisors (8173).

671387 is an equidigital number, since it uses as much as digits as its factorization.

671387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8172.

The product of its digits is 7056, while the sum is 32.

The square root of 671387 is about 819.3820842562. The cubic root of 671387 is about 87.5637413101.

It can be divided in two parts, 67 and 1387, that multiplied together give a palindrome (92929).

The spelling of 671387 in words is "six hundred seventy-one thousand, three hundred eighty-seven".