438240889 has 4 divisors (see below), whose sum is σ = 439019856. Its totient is φ = 437461924.

The previous prime is 438240883. The next prime is 438240911. The reversal of 438240889 is 988042834.

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, and also an emirpimes, since its reverse is a distinct semiprime: 988042834 = 2 ⋅494021417.

It is a cyclic number.

It is not a de Polignac number, because 438240889 - 2⁵ = 438240857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438240883) 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, 388639 + ... + 389764.

It is an arithmetic number, because the mean of its divisors is an integer number (109754964).

Almost surely, 2^438240889 is an apocalyptic number.

It is an amenable number.

438240889 is a deficient number, since it is larger than the sum of its proper divisors (778967).

438240889 is an equidigital number, since it uses as much as digits as its factorization.

438240889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778966.

The product of its (nonzero) digits is 442368, while the sum is 46.

The square root of 438240889 is about 20934.2038062115. The cubic root of 438240889 is about 759.5755299387.

The spelling of 438240889 in words is "four hundred thirty-eight million, two hundred forty thousand, eight hundred eighty-nine".