1023209939 has 2 divisors, whose sum is σ = 1023209940. Its totient is φ = 1023209938.

The previous prime is 1023209933. The next prime is 1023210031. The reversal of 1023209939 is 9399023201.

It is a weak prime.

It is an emirp because it is prime and its reverse (9399023201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023209939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1023209933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511604969 + 511604970.

It is an arithmetic number, because the mean of its divisors is an integer number (511604970).

Almost surely, 2^1023209939 is an apocalyptic number.

1023209939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023209939 is an equidigital number, since it uses as much as digits as its factorization.

1023209939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 1023209939 is about 31987.6529148357. The cubic root of 1023209939 is about 1007.6775506981.

The spelling of 1023209939 in words is "one billion, twenty-three million, two hundred nine thousand, nine hundred thirty-nine".