420890 has 8 divisors (see below), whose sum is σ = 757620. Its totient is φ = 168352.

The previous prime is 420859. The next prime is 420899. The reversal of 420890 is 98024.

It can be written as a sum of positive squares in 2 ways, for example, as 388129 + 32761 = 623^2 + 181^2 .

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 420890.

It is not an unprimeable number, because it can be changed into a prime (420899) 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, 21035 + ... + 21054.

2⁴²⁰⁸⁹⁰ is an apocalyptic number.

420890 is a deficient number, since it is larger than the sum of its proper divisors (336730).

420890 is a wasteful number, since it uses less digits than its factorization.

420890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42096.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 420890 is about 648.7603563721. The cubic root of 420890 is about 74.9415841426.

The spelling of 420890 in words is "four hundred twenty thousand, eight hundred ninety".