421603438 has 4 divisors (see below), whose sum is σ = 632405160. Its totient is φ = 210801718.

The previous prime is 421603423. The next prime is 421603447. The reversal of 421603438 is 834306124.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105400858 + ... + 105400861.

It is an arithmetic number, because the mean of its divisors is an integer number (158101290).

Almost surely, 2^421603438 is an apocalyptic number.

421603438 is a deficient number, since it is larger than the sum of its proper divisors (210801722).

421603438 is a wasteful number, since it uses less digits than its factorization.

421603438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210801721.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 421603438 is about 20532.9841474638. The cubic root of 421603438 is about 749.8390398286.

The spelling of 421603438 in words is "four hundred twenty-one million, six hundred three thousand, four hundred thirty-eight".