438906643 has 4 divisors (see below), whose sum is σ = 501607600. Its totient is φ = 376205688.

The previous prime is 438906641. The next prime is 438906673. The reversal of 438906643 is 346609834.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 438906643 - 2¹ = 438906641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 438906643.

It is not an unprimeable number, because it can be changed into a prime (438906641) 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, 31350468 + ... + 31350481.

It is an arithmetic number, because the mean of its divisors is an integer number (125401900).

Almost surely, 2^438906643 is an apocalyptic number.

438906643 is a deficient number, since it is larger than the sum of its proper divisors (62700957).

438906643 is an equidigital number, since it uses as much as digits as its factorization.

438906643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62700956.

The product of its (nonzero) digits is 373248, while the sum is 43.

The square root of 438906643 is about 20950.0988780483. The cubic root of 438906643 is about 759.9599719223.

The spelling of 438906643 in words is "four hundred thirty-eight million, nine hundred six thousand, six hundred forty-three".