438143381 has 16 divisors (see below), whose sum is σ = 492844800. Its totient is φ = 386814528.

The previous prime is 438143327. The next prime is 438143411. The reversal of 438143381 is 183341834.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-438143381 is a prime.

It is a super-2 number, since 2×438143381² = 383939244628222322, 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 (438143581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20660 + ... + 36098.

It is an arithmetic number, because the mean of its divisors is an integer number (30802800).

Almost surely, 2^438143381 is an apocalyptic number.

It is an amenable number.

438143381 is a deficient number, since it is larger than the sum of its proper divisors (54701419).

438143381 is a wasteful number, since it uses less digits than its factorization.

438143381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15548.

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

The square root of 438143381 is about 20931.8747607566. The cubic root of 438143381 is about 759.5191909203.

The spelling of 438143381 in words is "four hundred thirty-eight million, one hundred forty-three thousand, three hundred eighty-one".