438388381 has 8 divisors (see below), whose sum is σ = 440654328. Its totient is φ = 436128000.

The previous prime is 438388373. The next prime is 438388393. The reversal of 438388381 is 183883834.

It can be written as a sum of positive squares in 4 ways, for example, as 303944356 + 134444025 = 17434^2 + 11595^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 438388381 - 2³ = 438388373 is a prime.

It is a super-2 number, since 2×438388381² = 384368745191602322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438388351) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 331201 + ... + 332521.

It is an arithmetic number, because the mean of its divisors is an integer number (55081791).

Almost surely, 2^438388381 is an apocalyptic number.

It is an amenable number.

438388381 is a deficient number, since it is larger than the sum of its proper divisors (2265947).

438388381 is a wasteful number, since it uses less digits than its factorization.

438388381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783.

The product of its digits is 442368, while the sum is 46.

The square root of 438388381 is about 20937.7262614640. The cubic root of 438388381 is about 759.6607332679.

The spelling of 438388381 in words is "four hundred thirty-eight million, three hundred eighty-eight thousand, three hundred eighty-one".