421603388 has 24 divisors (see below), whose sum is σ = 777586320. Its totient is φ = 199463040.

The previous prime is 421603381. The next prime is 421603423. The reversal of 421603388 is 883306124.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421603381) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 69518 + ... + 75338.

It is an arithmetic number, because the mean of its divisors is an integer number (32399430).

Almost surely, 2^421603388 is an apocalyptic number.

It is an amenable number.

421603388 is a deficient number, since it is larger than the sum of its proper divisors (355982932).

421603388 is a wasteful number, since it uses less digits than its factorization.

421603388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6797 (or 6795 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 421603388 is about 20532.9829299106. The cubic root of 421603388 is about 749.8390101863.

The spelling of 421603388 in words is "four hundred twenty-one million, six hundred three thousand, three hundred eighty-eight".