438685013 has 4 divisors (see below), whose sum is σ = 472430028. Its totient is φ = 404940000.

The previous prime is 438685007. The next prime is 438685033. The reversal of 438685013 is 310586834.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310586834 = 2 ⋅155293417.

It can be written as a sum of positive squares in 2 ways, for example, as 59876644 + 378808369 = 7738^2 + 19463^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-438685013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438685033) 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, 16872488 + ... + 16872513.

It is an arithmetic number, because the mean of its divisors is an integer number (118107507).

Almost surely, 2^438685013 is an apocalyptic number.

It is an amenable number.

438685013 is a deficient number, since it is larger than the sum of its proper divisors (33745015).

438685013 is a wasteful number, since it uses less digits than its factorization.

438685013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33745014.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 438685013 is about 20944.8087362955. The cubic root of 438685013 is about 759.8320340952.

The spelling of 438685013 in words is "four hundred thirty-eight million, six hundred eighty-five thousand, thirteen".