1673409 has 4 divisors (see below), whose sum is σ = 2231216. Its totient is φ = 1115604.

The previous prime is 1673407. The next prime is 1673437. The reversal of 1673409 is 9043761.

It is a happy number.

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 not a de Polignac number, because 1673409 - 2¹ = 1673407 is a prime.

It is a D-number.

It is a Duffinian number.

1673409 is a lucky number.

It is a plaindrome in base 13.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (1673401) 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, 278899 + ... + 278904.

It is an arithmetic number, because the mean of its divisors is an integer number (557804).

2^1673409 is an apocalyptic number.

It is an amenable number.

1673409 is a deficient number, since it is larger than the sum of its proper divisors (557807).

1673409 is an equidigital number, since it uses as much as digits as its factorization.

1673409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557806.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 1673409 is about 1293.6031076029. The cubic root of 1673409 is about 118.7227734441.

The spelling of 1673409 in words is "one million, six hundred seventy-three thousand, four hundred nine".