1243767428 has 12 divisors (see below), whose sum is σ = 2251648140. Its totient is φ = 600439392.

The previous prime is 1243767409. The next prime is 1243767443. The reversal of 1243767428 is 8247673421.

It can be written as a sum of positive squares in 2 ways, for example, as 1045746244 + 198021184 = 32338^2 + 14072^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5360951 + ... + 5361182.

It is an arithmetic number, because the mean of its divisors is an integer number (187637345).

Almost surely, 2^1243767428 is an apocalyptic number.

It is an amenable number.

1243767428 is a deficient number, since it is larger than the sum of its proper divisors (1007880712).

1243767428 is a wasteful number, since it uses less digits than its factorization.

1243767428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10722166 (or 10722164 counting only the distinct ones).

The product of its digits is 451584, while the sum is 44.

The square root of 1243767428 is about 35267.0870359320. The cubic root of 1243767428 is about 1075.4240052300.

The spelling of 1243767428 in words is "one billion, two hundred forty-three million, seven hundred sixty-seven thousand, four hundred twenty-eight".