1671409 has 4 divisors (see below), whose sum is σ = 1678320. Its totient is φ = 1664500.

The previous prime is 1671379. The next prime is 1671421. The reversal of 1671409 is 9041761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1671409 - 2¹¹ = 1669361 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1671209) 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, 3079 + ... + 3580.

It is an arithmetic number, because the mean of its divisors is an integer number (419580).

2^1671409 is an apocalyptic number.

It is an amenable number.

1671409 is a deficient number, since it is larger than the sum of its proper divisors (6911).

1671409 is an equidigital number, since it uses as much as digits as its factorization.

1671409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6910.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1671409 is about 1292.8298418585. The cubic root of 1671409 is about 118.6754568178.

It can be divided in two parts, 1671 and 409, that added together give a triangular number (2080 = T₆₄).

The spelling of 1671409 in words is "one million, six hundred seventy-one thousand, four hundred nine".