1671345 has 24 divisors (see below), whose sum is σ = 3120936. Its totient is φ = 822528.

The previous prime is 1671343. The next prime is 1671347. The reversal of 1671345 is 5431761.

It is an interprime number because it is at equal distance from previous prime (1671343) and next prime (1671347).

It can be written as a sum of positive squares in 4 ways, for example, as 76176 + 1595169 = 276^2 + 1263^2 .

It is not a de Polignac number, because 1671345 - 2¹ = 1671343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1671343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 844 + ... + 2013.

It is an arithmetic number, because the mean of its divisors is an integer number (130039).

2^1671345 is an apocalyptic number.

1671345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1671345 is a deficient number, since it is larger than the sum of its proper divisors (1449591).

1671345 is a wasteful number, since it uses less digits than its factorization.

1671345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881 (or 2878 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 1671345 is about 1292.8050897177. The cubic root of 1671345 is about 118.6739420626.

It can be divided in two parts, 1671 and 345, that added together give a triangular number (2016 = T₆₃).

The spelling of 1671345 in words is "one million, six hundred seventy-one thousand, three hundred forty-five".