1555428839 has 2 divisors, whose sum is σ = 1555428840. Its totient is φ = 1555428838.

The previous prime is 1555428827. The next prime is 1555428989. The reversal of 1555428839 is 9388245551.

It is a weak prime.

It is an emirp because it is prime and its reverse (9388245551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1555428839 - 2²⁰ = 1554380263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555424839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777714419 + 777714420.

It is an arithmetic number, because the mean of its divisors is an integer number (777714420).

Almost surely, 2^1555428839 is an apocalyptic number.

1555428839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555428839 is an equidigital number, since it uses as much as digits as its factorization.

1555428839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728000, while the sum is 50.

The square root of 1555428839 is about 39438.9254290732. The cubic root of 1555428839 is about 1158.6440852895.

The spelling of 1555428839 in words is "one billion, five hundred fifty-five million, four hundred twenty-eight thousand, eight hundred thirty-nine".