438865861 has 4 divisors (see below), whose sum is σ = 501560992. Its totient is φ = 376170732.

The previous prime is 438865859. The next prime is 438865871. The reversal of 438865861 is 168568834.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 438865861 - 2¹ = 438865859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438865841) 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, 31347555 + ... + 31347568.

It is an arithmetic number, because the mean of its divisors is an integer number (125390248).

Almost surely, 2^438865861 is an apocalyptic number.

It is an amenable number.

438865861 is a deficient number, since it is larger than the sum of its proper divisors (62695131).

438865861 is an equidigital number, since it uses as much as digits as its factorization.

438865861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62695130.

The product of its digits is 1105920, while the sum is 49.

The square root of 438865861 is about 20949.1255426092. The cubic root of 438865861 is about 759.9364333953.

The spelling of 438865861 in words is "four hundred thirty-eight million, eight hundred sixty-five thousand, eight hundred sixty-one".