420724 has 12 divisors (see below), whose sum is σ = 743904. Its totient is φ = 208184.

The previous prime is 420691. The next prime is 420731. The reversal of 420724 is 427024.

420724 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

It is a nialpdrome in base 9.

It is a congruent number.

It is an unprimeable number.

420724 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 64 + ... + 919.

It is an arithmetic number, because the mean of its divisors is an integer number (61992).

2⁴²⁰⁷²⁴ is an apocalyptic number.

It is an amenable number.

420724 is a deficient number, since it is larger than the sum of its proper divisors (323180).

420724 is a wasteful number, since it uses less digits than its factorization.

420724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 420724 is about 648.6324074543. The cubic root of 420724 is about 74.9317304684.

Adding to 420724 its reverse (427024), we get a palindrome (847748).

The spelling of 420724 in words is "four hundred twenty thousand, seven hundred twenty-four", and thus it is an iban number.