12785217438 has 32 divisors (see below), whose sum is σ = 30942376704. Its totient is φ = 3438041472.

The previous prime is 12785217427. The next prime is 12785217449. The reversal of 12785217438 is 83471258721.

It is an interprime number because it is at equal distance from previous prime (12785217427) and next prime (12785217449).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8952520 + ... + 8953947.

It is an arithmetic number, because the mean of its divisors is an integer number (966949272).

Almost surely, 2^12785217438 is an apocalyptic number.

12785217438 is an abundant number, since it is smaller than the sum of its proper divisors (18157159266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12785217438 is a wasteful number, since it uses less digits than its factorization.

12785217438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17906496.

The product of its digits is 752640, while the sum is 48.

The spelling of 12785217438 in words is "twelve billion, seven hundred eighty-five million, two hundred seventeen thousand, four hundred thirty-eight".