438191086 has 4 divisors (see below), whose sum is σ = 657286632. Its totient is φ = 219095542.

The previous prime is 438191081. The next prime is 438191087. The reversal of 438191086 is 680191834.

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

It is a super-2 number, since 2×438191086² = 384022855699718792, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438191081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109547770 + ... + 109547773.

It is an arithmetic number, because the mean of its divisors is an integer number (164321658).

Almost surely, 2^438191086 is an apocalyptic number.

438191086 is a deficient number, since it is larger than the sum of its proper divisors (219095546).

438191086 is a wasteful number, since it uses less digits than its factorization.

438191086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219095545.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 438191086 is about 20933.0142597763. The cubic root of 438191086 is about 759.5467553735.

The spelling of 438191086 in words is "four hundred thirty-eight million, one hundred ninety-one thousand, eighty-six".