438011621 has 4 divisors (see below), whose sum is σ = 453115500. Its totient is φ = 422907744.

The previous prime is 438011611. The next prime is 438011633. The reversal of 438011621 is 126110834.

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

It can be written as a sum of positive squares in 2 ways, for example, as 246050596 + 191961025 = 15686^2 + 13855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-438011621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438011611) 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, 7551896 + ... + 7551953.

It is an arithmetic number, because the mean of its divisors is an integer number (113278875).

Almost surely, 2^438011621 is an apocalyptic number.

It is an amenable number.

438011621 is a deficient number, since it is larger than the sum of its proper divisors (15103879).

438011621 is a wasteful number, since it uses less digits than its factorization.

438011621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15103878.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 438011621 is about 20928.7271710441. The cubic root of 438011621 is about 759.4430482038.

The spelling of 438011621 in words is "four hundred thirty-eight million, eleven thousand, six hundred twenty-one".