15438219812 has 6 divisors (see below), whose sum is σ = 27016884678. Its totient is φ = 7719109904.

The previous prime is 15438219793. The next prime is 15438219829. The reversal of 15438219812 is 21891283451.

It can be written as a sum of positive squares in only one way, i.e., 14627451136 + 810768676 = 120944^2 + 28474^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1929777473 + ... + 1929777480.

It is an arithmetic number, because the mean of its divisors is an integer number (4502814113).

Almost surely, 2^15438219812 is an apocalyptic number.

It is an amenable number.

15438219812 is a deficient number, since it is larger than the sum of its proper divisors (11578664866).

15438219812 is a wasteful number, since it uses less digits than its factorization.

15438219812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859554957 (or 3859554955 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The spelling of 15438219812 in words is "fifteen billion, four hundred thirty-eight million, two hundred nineteen thousand, eight hundred twelve".