1238123653452 has 144 divisors (see below), whose sum is σ = 3713528512512. Its totient is φ = 340359131520.

The previous prime is 1238123653369. The next prime is 1238123653513. The reversal of 1238123653452 is 2543563218321.

1238123653452 is a `hidden beast` number, since 1 + 2 + 3 + 81 + 2 + 36 + 534 + 5 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1238123653398 and 1238123653407.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 893413 + ... + 1809539.

It is an arithmetic number, because the mean of its divisors is an integer number (25788392448).

Almost surely, 2^{1238123653452} is an apocalyptic number.

1238123653452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1238123653452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1856764256256).

1238123653452 is an abundant number, since it is smaller than the sum of its proper divisors (2475404859060).

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

1238123653452 is a wasteful number, since it uses less digits than its factorization.

1238123653452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916348 (or 916343 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 1238123653452 in words is "one trillion, two hundred thirty-eight billion, one hundred twenty-three million, six hundred fifty-three thousand, four hundred fifty-two".