1828778239 has 2 divisors, whose sum is σ = 1828778240. Its totient is φ = 1828778238.

The previous prime is 1828778221. The next prime is 1828778267. The reversal of 1828778239 is 9328778281.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1828778239 is a prime.

It is a super-2 number, since 2×1828778239² = 6688859694879882242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1828778239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1828778269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 914389119 + 914389120.

It is an arithmetic number, because the mean of its divisors is an integer number (914389120).

Almost surely, 2^1828778239 is an apocalyptic number.

1828778239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1828778239 is an equidigital number, since it uses as much as digits as its factorization.

1828778239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 55.

The square root of 1828778239 is about 42764.2168056425. The cubic root of 1828778239 is about 1222.8889341456. Note that the first 3 decimals are identical.

The spelling of 1828778239 in words is "one billion, eight hundred twenty-eight million, seven hundred seventy-eight thousand, two hundred thirty-nine".