438247975643 has 4 divisors (see below), whose sum is σ = 438405791880. Its totient is φ = 438090159408.

The previous prime is 438247975639. The next prime is 438247975661. The reversal of 438247975643 is 346579742834.

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 438247975643 - 2² = 438247975639 is a prime.

It is a super-2 number, since 2×438247975643² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438247975603) 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, 78903953 + ... + 78909506.

It is an arithmetic number, because the mean of its divisors is an integer number (109601447970).

Almost surely, 2^438247975643 is an apocalyptic number.

438247975643 is a deficient number, since it is larger than the sum of its proper divisors (157816237).

438247975643 is a wasteful number, since it uses less digits than its factorization.

438247975643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157816236.

The product of its digits is 121927680, while the sum is 62.

The spelling of 438247975643 in words is "four hundred thirty-eight billion, two hundred forty-seven million, nine hundred seventy-five thousand, six hundred forty-three".