1223643287172 has 96 divisors (see below), whose sum is σ = 2879134612480. Its totient is φ = 404475793920.

The previous prime is 1223643287089. The next prime is 1223643287201. The reversal of 1223643287172 is 2717823463221.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1234755597 + ... + 1234756587.

Almost surely, 2^{1223643287172} is an apocalyptic number.

1223643287172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1223643287172 is an abundant number, since it is smaller than the sum of its proper divisors (1655491325308).

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

1223643287172 is a wasteful number, since it uses less digits than its factorization.

1223643287172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573 (or 2571 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 48.

The spelling of 1223643287172 in words is "one trillion, two hundred twenty-three billion, six hundred forty-three million, two hundred eighty-seven thousand, one hundred seventy-two".