1020238399 has 2 divisors, whose sum is σ = 1020238400. Its totient is φ = 1020238398.

The previous prime is 1020238397. The next prime is 1020238403. The reversal of 1020238399 is 9938320201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020238399 - 2¹ = 1020238397 is a prime.

Together with 1020238397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020238397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510119199 + 510119200.

It is an arithmetic number, because the mean of its divisors is an integer number (510119200).

Almost surely, 2^1020238399 is an apocalyptic number.

1020238399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020238399 is an equidigital number, since it uses as much as digits as its factorization.

1020238399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 1020238399 is about 31941.1709084060. The cubic root of 1020238399 is about 1006.7011275841.

The spelling of 1020238399 in words is "one billion, twenty million, two hundred thirty-eight thousand, three hundred ninety-nine".