1038247921 has 4 divisors (see below), whose sum is σ = 1038338532. Its totient is φ = 1038157312.

The previous prime is 1038247901. The next prime is 1038247933. The reversal of 1038247921 is 1297428301.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1297428301 = 13 ⋅99802177.

It can be written as a sum of positive squares in 2 ways, for example, as 961930225 + 76317696 = 31015^2 + 8736^2 .

It is a cyclic number.

It is not a de Polignac number, because 1038247921 - 2¹⁹ = 1037723633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1038247901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25120 + ... + 52033.

It is an arithmetic number, because the mean of its divisors is an integer number (259584633).

Almost surely, 2^1038247921 is an apocalyptic number.

It is an amenable number.

1038247921 is a deficient number, since it is larger than the sum of its proper divisors (90611).

1038247921 is an equidigital number, since it uses as much as digits as its factorization.

1038247921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90610.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1038247921 is about 32221.8547107394. The cubic root of 1038247921 is about 1012.5901303904.

The spelling of 1038247921 in words is "one billion, thirty-eight million, two hundred forty-seven thousand, nine hundred twenty-one".