1243128425 has 48 divisors (see below), whose sum is σ = 1928638464. Its totient is φ = 772200000.

The previous prime is 1243128391. The next prime is 1243128431. The reversal of 1243128425 is 5248213421.

It is not a de Polignac number, because 1243128425 - 2⁶ = 1243128361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243128391 and 1243128400.

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, 636200 + ... + 638150.

It is an arithmetic number, because the mean of its divisors is an integer number (40179968).

Almost surely, 2^1243128425 is an apocalyptic number.

It is an amenable number.

1243128425 is a deficient number, since it is larger than the sum of its proper divisors (685510039).

1243128425 is a wasteful number, since it uses less digits than its factorization.

1243128425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310 (or 2305 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 1243128425 is about 35258.0263911638. The cubic root of 1243128425 is about 1075.2398022808.

The spelling of 1243128425 in words is "one billion, two hundred forty-three million, one hundred twenty-eight thousand, four hundred twenty-five".