420139 has 4 divisors (see below), whose sum is σ = 427320. Its totient is φ = 412960.

The previous prime is 420103. The next prime is 420149. The reversal of 420139 is 931024.

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

It is a cyclic number.

It is not a de Polignac number, because 420139 - 2¹³ = 411947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420149) 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, 3502 + ... + 3619.

It is an arithmetic number, because the mean of its divisors is an integer number (106830).

2⁴²⁰¹³⁹ is an apocalyptic number.

420139 is a deficient number, since it is larger than the sum of its proper divisors (7181).

420139 is an equidigital number, since it uses as much as digits as its factorization.

420139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7180.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 420139 is about 648.1813017976. The cubic root of 420139 is about 74.8969844948.

The spelling of 420139 in words is "four hundred twenty thousand, one hundred thirty-nine".