1538420399 has 2 divisors, whose sum is σ = 1538420400. Its totient is φ = 1538420398.

The previous prime is 1538420383. The next prime is 1538420407. The reversal of 1538420399 is 9930248351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1538420399 - 2⁴ = 1538420383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1538420699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769210199 + 769210200.

It is an arithmetic number, because the mean of its divisors is an integer number (769210200).

Almost surely, 2^1538420399 is an apocalyptic number.

1538420399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538420399 is an equidigital number, since it uses as much as digits as its factorization.

1538420399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 1538420399 is about 39222.7025968380. The cubic root of 1538420399 is about 1154.4053832308.

The spelling of 1538420399 in words is "one billion, five hundred thirty-eight million, four hundred twenty thousand, three hundred ninety-nine".