421351540 has 12 divisors (see below), whose sum is σ = 884838276. Its totient is φ = 168540608.

The previous prime is 421351517. The next prime is 421351571. The reversal of 421351540 is 45153124.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 158457744 + 262893796 = 12588^2 + 16214^2 .

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, 10533769 + ... + 10533808.

It is an arithmetic number, because the mean of its divisors is an integer number (73736523).

Almost surely, 2^421351540 is an apocalyptic number.

It is an amenable number.

421351540 is an abundant number, since it is smaller than the sum of its proper divisors (463486736).

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

421351540 is a wasteful number, since it uses less digits than its factorization.

421351540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21067586 (or 21067584 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 421351540 is about 20526.8492467792. The cubic root of 421351540 is about 749.6896730955.

The spelling of 421351540 in words is "four hundred twenty-one million, three hundred fifty-one thousand, five hundred forty".