8427409 has 3 divisors (see below), whose sum is σ = 8430313. Its totient is φ = 8424506.

The previous prime is 8427403. The next prime is 8427413. The reversal of 8427409 is 9047248.

It is a happy number.

The square root of 8427409 is 2903.

It is a perfect power (a square), and thus also a powerful number.

8427409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 8427409 - 2³ = 8427401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8427401) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1452 + ... + 4354.

Almost surely, 2^8427409 is an apocalyptic number.

8427409 is the 2903-rd square number.

8427409 is the 1452-nd centered octagonal number.

It is an amenable number.

8427409 is a deficient number, since it is larger than the sum of its proper divisors (2904).

8427409 is an frugal number, since it uses more digits than its factorization.

8427409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5806 (or 2903 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The cubic root of 8427409 is about 203.5001297924.

It can be divided in two parts, 8427 and 409, that added together give a square (8836 = 94²).

The spelling of 8427409 in words is "eight million, four hundred twenty-seven thousand, four hundred nine".