1243690384 has 20 divisors (see below), whose sum is σ = 2427243084. Its totient is φ = 617305088.

The previous prime is 1243690367. The next prime is 1243690423. The reversal of 1243690384 is 4830963421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 243360000 + 1000330384 = 15600^2 + 31628^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281497 + ... + 285880.

Almost surely, 2^1243690384 is an apocalyptic number.

It is an amenable number.

1243690384 is a deficient number, since it is larger than the sum of its proper divisors (1183552700).

1243690384 is a wasteful number, since it uses less digits than its factorization.

1243690384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567522 (or 567516 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 1243690384 is about 35265.9947257978. The cubic root of 1243690384 is about 1075.4017993964.

The spelling of 1243690384 in words is "one billion, two hundred forty-three million, six hundred ninety thousand, three hundred eighty-four".