438343781 has 4 divisors (see below), whose sum is σ = 438622272. Its totient is φ = 438065292.

The previous prime is 438343777. The next prime is 438343811. The reversal of 438343781 is 187343834.

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 a cyclic number.

It is not a de Polignac number, because 438343781 - 2² = 438343777 is a prime.

It is a super-2 number, since 2×438343781² = 384290540682751922, which 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 (438343481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136871 + ... + 140036.

It is an arithmetic number, because the mean of its divisors is an integer number (109655568).

Almost surely, 2^438343781 is an apocalyptic number.

It is an amenable number.

438343781 is a deficient number, since it is larger than the sum of its proper divisors (278491).

438343781 is a wasteful number, since it uses less digits than its factorization.

438343781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278490.

The product of its digits is 193536, while the sum is 41.

The square root of 438343781 is about 20936.6611712565. The cubic root of 438343781 is about 759.6349707103.

The spelling of 438343781 in words is "four hundred thirty-eight million, three hundred forty-three thousand, seven hundred eighty-one".