420790 has 16 divisors (see below), whose sum is σ = 784080. Its totient is φ = 162400.

The previous prime is 420781. The next prime is 420799. The reversal of 420790 is 97024.

It is an interprime number because it is at equal distance from previous prime (420781) and next prime (420799).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420799) by changing a digit.

420790 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436 + ... + 1015.

It is an arithmetic number, because the mean of its divisors is an integer number (49005).

2⁴²⁰⁷⁹⁰ is an apocalyptic number.

420790 is a deficient number, since it is larger than the sum of its proper divisors (363290).

420790 is a wasteful number, since it uses less digits than its factorization.

420790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 420790 is about 648.6832817331. The cubic root of 420790 is about 74.9356485046.

The spelling of 420790 in words is "four hundred twenty thousand, seven hundred ninety".