420109 has 4 divisors (see below), whose sum is σ = 442240. Its totient is φ = 397980.

The previous prime is 420103. The next prime is 420149. The reversal of 420109 is 901024.

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 420109 - 2⁹ = 419597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420092 and 420101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420103) 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, 11037 + ... + 11074.

It is an arithmetic number, because the mean of its divisors is an integer number (110560).

2⁴²⁰¹⁰⁹ is an apocalyptic number.

It is an amenable number.

420109 is a deficient number, since it is larger than the sum of its proper divisors (22131).

420109 is a wasteful number, since it uses less digits than its factorization.

420109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22130.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 420109 is about 648.1581597110. The cubic root of 420109 is about 74.8952017808.

It can be divided in two parts, 420 and 109, that added together give a square (529 = 23²).

The spelling of 420109 in words is "four hundred twenty thousand, one hundred nine".