427909 has 4 divisors (see below), whose sum is σ = 429760. Its totient is φ = 426060.

The previous prime is 427883. The next prime is 427913. The reversal of 427909 is 909724.

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 427909 - 2⁵ = 427877 is a prime.

It is a super-2 number, since 2×427909² = 366212224562, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

427909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427919) 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, 519 + ... + 1060.

It is an arithmetic number, because the mean of its divisors is an integer number (107440).

2⁴²⁷⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

427909 is a deficient number, since it is larger than the sum of its proper divisors (1851).

427909 is a wasteful number, since it uses less digits than its factorization.

427909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 427909 is about 654.1475368753. The cubic root of 427909 is about 75.3558790343.

The spelling of 427909 in words is "four hundred twenty-seven thousand, nine hundred nine".