420155 has 8 divisors (see below), whose sum is σ = 533952. Its totient is φ = 316288.

The previous prime is 420149. The next prime is 420163. The reversal of 420155 is 551024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420155 - 2¹⁶ = 354619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2387 + ... + 2556.

It is an arithmetic number, because the mean of its divisors is an integer number (66744).

2⁴²⁰¹⁵⁵ is an apocalyptic number.

420155 is a deficient number, since it is larger than the sum of its proper divisors (113797).

420155 is a wasteful number, since it uses less digits than its factorization.

420155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 420155 is about 648.1936439059. The cubic root of 420155 is about 74.8979352409.

Adding to 420155 its reverse (551024), we get a palindrome (971179).

It can be divided in two parts, 420 and 155, that added together give a palindrome (575).

The spelling of 420155 in words is "four hundred twenty thousand, one hundred fifty-five".