672409 has 4 divisors (see below), whose sum is σ = 674100. Its totient is φ = 670720.

The previous prime is 672379. The next prime is 672439. The reversal of 672409 is 904276.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (672379) and next prime (672439).

It can be written as a sum of positive squares in 2 ways, for example, as 608400 + 64009 = 780^2 + 253^2 .

It is a cyclic number.

It is not a de Polignac number, because 672409 - 2⁵ = 672377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672439) 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, 117 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (168525).

2⁶⁷²⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

672409 is a deficient number, since it is larger than the sum of its proper divisors (1691).

672409 is a wasteful number, since it uses less digits than its factorization.

672409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 672409 is about 820.0054877865. The cubic root of 672409 is about 87.6081492665.

It can be divided in two parts, 672 and 409, that added together give a triangular number (1081 = T₄₆).

The spelling of 672409 in words is "six hundred seventy-two thousand, four hundred nine".