671385 has 32 divisors (see below), whose sum is σ = 1266048. Its totient is φ = 299520.

The previous prime is 671383. The next prime is 671401. The reversal of 671385 is 583176.

671385 = T₁₁₀ + T₁₁₁ + ... + T₁₇₄.

It is not a de Polignac number, because 671385 - 2¹ = 671383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671383) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1989 + ... + 2301.

It is an arithmetic number, because the mean of its divisors is an integer number (39564).

2⁶⁷¹³⁸⁵ is an apocalyptic number.

671385 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

671385 is a deficient number, since it is larger than the sum of its proper divisors (594663).

671385 is a wasteful number, since it uses less digits than its factorization.

671385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345.

The product of its digits is 5040, while the sum is 30.

The square root of 671385 is about 819.3808638234. The cubic root of 671385 is about 87.5636543619.

Subtracting from 671385 its reverse (583176), we obtain a square (88209 = 297²).

The spelling of 671385 in words is "six hundred seventy-one thousand, three hundred eighty-five".