438685749 has 12 divisors (see below), whose sum is σ = 636844000. Its totient is φ = 290986344.

The previous prime is 438685747. The next prime is 438685757. The reversal of 438685749 is 947586834.

438685749 is a `hidden beast` number, since 4 + 3 + 8 + 68 + 574 + 9 = 666.

It is not a de Polignac number, because 438685749 - 2¹ = 438685747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 438685695 and 438685704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438685747) 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 11 ways as a sum of consecutive naturals, for example, 120679 + ... + 124260.

Almost surely, 2^438685749 is an apocalyptic number.

It is an amenable number.

438685749 is a deficient number, since it is larger than the sum of its proper divisors (198158251).

438685749 is a wasteful number, since it uses less digits than its factorization.

438685749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245144 (or 245141 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 438685749 is about 20944.8263062743. The cubic root of 438685749 is about 759.8324590288.

The spelling of 438685749 in words is "four hundred thirty-eight million, six hundred eighty-five thousand, seven hundred forty-nine".