487409 has 4 divisors (see below), whose sum is σ = 524916. Its totient is φ = 449904.

The previous prime is 487397. The next prime is 487423. The reversal of 487409 is 904784.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 93025 + 394384 = 305^2 + 628^2 .

It is a de Polignac number, because none of the positive numbers 2^k-487409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (487429) 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, 18734 + ... + 18759.

It is an arithmetic number, because the mean of its divisors is an integer number (131229).

2⁴⁸⁷⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

487409 is a deficient number, since it is larger than the sum of its proper divisors (37507).

487409 is a wasteful number, since it uses less digits than its factorization.

487409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37506.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 487409 is about 698.1468326935. The cubic root of 487409 is about 78.6981484484.

The spelling of 487409 in words is "four hundred eighty-seven thousand, four hundred nine".