420722 has 4 divisors (see below), whose sum is σ = 631086. Its totient is φ = 210360.

The previous prime is 420691. The next prime is 420731. The reversal of 420722 is 227024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 312481 + 108241 = 559^2 + 329^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 420722.

It is an unprimeable 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 as a sum of consecutive naturals, namely, 105179 + ... + 105182.

2⁴²⁰⁷²² is an apocalyptic number.

420722 is a deficient number, since it is larger than the sum of its proper divisors (210364).

420722 is a wasteful number, since it uses less digits than its factorization.

420722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210363.

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

The square root of 420722 is about 648.6308657472. The cubic root of 420722 is about 74.9316117336.

Adding to 420722 its reverse (227024), we get a palindrome (647746).

The spelling of 420722 in words is "four hundred twenty thousand, seven hundred twenty-two", and thus it is an iban number.