438781853 has 4 divisors (see below), whose sum is σ = 450640860. Its totient is φ = 426922848.

The previous prime is 438781831. The next prime is 438781891. The reversal of 438781853 is 358187834.

It is a happy number.

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 171034084 + 267747769 = 13078^2 + 16363^2 .

It is a cyclic number.

It is not a de Polignac number, because 438781853 - 2²⁴ = 422004637 is a prime.

It is a super-2 number, since 2×438781853² = 385059029044227218, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 438781798 and 438781807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438781823) 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, 5929448 + ... + 5929521.

It is an arithmetic number, because the mean of its divisors is an integer number (112660215).

Almost surely, 2^438781853 is an apocalyptic number.

It is an amenable number.

438781853 is a deficient number, since it is larger than the sum of its proper divisors (11859007).

438781853 is a wasteful number, since it uses less digits than its factorization.

438781853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11859006.

The product of its digits is 645120, while the sum is 47.

The square root of 438781853 is about 20947.1203987565. The cubic root of 438781853 is about 759.8879411190.

The spelling of 438781853 in words is "four hundred thirty-eight million, seven hundred eighty-one thousand, eight hundred fifty-three".