421090 has 16 divisors (see below), whose sum is σ = 802872. Its totient is φ = 158464.

The previous prime is 421081. The next prime is 421093. The reversal of 421090 is 90124.

It can be written as a sum of positive squares in 4 ways, for example, as 380689 + 40401 = 617^2 + 201^2 .

It is not an unprimeable number, because it can be changed into a prime (421093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1069 + ... + 1408.

2⁴²¹⁰⁹⁰ is an apocalyptic number.

421090 is a deficient number, since it is larger than the sum of its proper divisors (381782).

421090 is a wasteful number, since it uses less digits than its factorization.

421090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501.

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

The square root of 421090 is about 648.9144781865. The cubic root of 421090 is about 74.9534525987.

The spelling of 421090 in words is "four hundred twenty-one thousand, ninety".