420740 has 24 divisors (see below), whose sum is σ = 896280. Its totient is φ = 165888.

The previous prime is 420737. The next prime is 420743. The reversal of 420740 is 47024.

420740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (420737) and next prime (420743).

It can be written as a sum of positive squares in 4 ways, for example, as 33856 + 386884 = 184^2 + 622^2 .

420740 is a modest number, since divided by 740 gives 420 as remainder.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 420740.

It is not an unprimeable number, because it can be changed into a prime (420743) 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, 2084 + ... + 2276.

It is an arithmetic number, because the mean of its divisors is an integer number (37345).

2⁴²⁰⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

420740 is an abundant number, since it is smaller than the sum of its proper divisors (475540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420740 is a wasteful number, since it uses less digits than its factorization.

420740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 420740 is about 648.6447409792. The cubic root of 420740 is about 74.9326803330.

Adding to 420740 its reverse (47024), we get a palindrome (467764).

The spelling of 420740 in words is "four hundred twenty thousand, seven hundred forty", and thus it is an iban number.