1671445 has 4 divisors (see below), whose sum is σ = 2005740. Its totient is φ = 1337152.

The previous prime is 1671443. The next prime is 1671451. The reversal of 1671445 is 5441761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5441761 = 13 ⋅418597.

It can be written as a sum of positive squares in 2 ways, for example, as 209764 + 1461681 = 458^2 + 1209^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671445 - 2¹ = 1671443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671443) 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, 167140 + ... + 167149.

It is an arithmetic number, because the mean of its divisors is an integer number (501435).

2^1671445 is an apocalyptic number.

It is an amenable number.

1671445 is a deficient number, since it is larger than the sum of its proper divisors (334295).

1671445 is an equidigital number, since it uses as much as digits as its factorization.

1671445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334294.

The product of its digits is 3360, while the sum is 28.

The square root of 1671445 is about 1292.8437647295. The cubic root of 1671445 is about 118.6763088505.

It can be divided in two parts, 1671 and 445, that added together give a square (2116 = 46²).

The spelling of 1671445 in words is "one million, six hundred seventy-one thousand, four hundred forty-five".