438605421 has 4 divisors (see below), whose sum is σ = 584807232. Its totient is φ = 292403612.

The previous prime is 438605399. The next prime is 438605459. The reversal of 438605421 is 124506834.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 438605421 - 2⁶ = 438605357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438605521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73100901 + ... + 73100906.

It is an arithmetic number, because the mean of its divisors is an integer number (146201808).

Almost surely, 2^438605421 is an apocalyptic number.

It is an amenable number.

438605421 is a deficient number, since it is larger than the sum of its proper divisors (146201811).

438605421 is a wasteful number, since it uses less digits than its factorization.

438605421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146201810.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 438605421 is about 20942.9086088824. The cubic root of 438605421 is about 759.7860784115.

The spelling of 438605421 in words is "four hundred thirty-eight million, six hundred five thousand, four hundred twenty-one".