421257808 has 20 divisors (see below), whose sum is σ = 824604340. Its totient is φ = 208456704.

The previous prime is 421257779. The next prime is 421257827. The reversal of 421257808 is 808752124.

It can be written as a sum of positive squares in 2 ways, for example, as 219276864 + 201980944 = 14808^2 + 14212^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134163 + ... + 137266.

It is an arithmetic number, because the mean of its divisors is an integer number (41230217).

Almost surely, 2^421257808 is an apocalyptic number.

It is an amenable number.

421257808 is a deficient number, since it is larger than the sum of its proper divisors (403346532).

421257808 is a wasteful number, since it uses less digits than its factorization.

421257808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271534 (or 271528 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 421257808 is about 20524.5659637421. The cubic root of 421257808 is about 749.6340780898.

The spelling of 421257808 in words is "four hundred twenty-one million, two hundred fifty-seven thousand, eight hundred eight".