1243807428 has 12 divisors (see below), whose sum is σ = 2902217360. Its totient is φ = 414602472.

The previous prime is 1243807427. The next prime is 1243807489. The reversal of 1243807428 is 8247083421.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1243807421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51825298 + ... + 51825321.

Almost surely, 2^1243807428 is an apocalyptic number.

It is an amenable number.

1243807428 is an abundant number, since it is smaller than the sum of its proper divisors (1658409932).

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

1243807428 is a wasteful number, since it uses less digits than its factorization.

1243807428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103650626 (or 103650624 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 1243807428 is about 35267.6541323633. The cubic root of 1243807428 is about 1075.4355337785.

The spelling of 1243807428 in words is "one billion, two hundred forty-three million, eight hundred seven thousand, four hundred twenty-eight".