438034378781 has 4 divisors (see below), whose sum is σ = 452164520064. Its totient is φ = 423904237500.

The previous prime is 438034378757. The next prime is 438034378799. The reversal of 438034378781 is 187873430834.

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: 187873430834 = 2 ⋅93936715417.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-438034378781 is a prime.

It is a super-2 number, since 2×438034378781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438034378711) 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, 7065070595 + ... + 7065070656.

It is an arithmetic number, because the mean of its divisors is an integer number (113041130016).

Almost surely, 2^438034378781 is an apocalyptic number.

It is an amenable number.

438034378781 is a deficient number, since it is larger than the sum of its proper divisors (14130141283).

438034378781 is a wasteful number, since it uses less digits than its factorization.

438034378781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14130141282.

The product of its (nonzero) digits is 10838016, while the sum is 56.

The spelling of 438034378781 in words is "four hundred thirty-eight billion, thirty-four million, three hundred seventy-eight thousand, seven hundred eighty-one".