438691645 has 16 divisors (see below), whose sum is σ = 605969280. Its totient is φ = 298649664.

The previous prime is 438691639. The next prime is 438691657. The reversal of 438691645 is 546196834.

It is a cyclic number.

It is not a de Polignac number, because 438691645 - 2²³ = 430303037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 438691595 and 438691604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40222 + ... + 49951.

It is an arithmetic number, because the mean of its divisors is an integer number (37873080).

Almost surely, 2^438691645 is an apocalyptic number.

It is an amenable number.

438691645 is a deficient number, since it is larger than the sum of its proper divisors (167277635).

438691645 is a wasteful number, since it uses less digits than its factorization.

438691645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90324.

The product of its digits is 622080, while the sum is 46.

The square root of 438691645 is about 20944.9670565508. The cubic root of 438691645 is about 759.8358630997.

The spelling of 438691645 in words is "four hundred thirty-eight million, six hundred ninety-one thousand, six hundred forty-five".