1828778399 has 8 divisors (see below), whose sum is σ = 2090631168. Its totient is φ = 1567075320.

The previous prime is 1828778387. The next prime is 1828778437. The reversal of 1828778399 is 9938778281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1828778399 - 2⁸ = 1828778143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1828748399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9887 + ... + 61280.

It is an arithmetic number, because the mean of its divisors is an integer number (261328896).

Almost surely, 2^1828778399 is an apocalyptic number.

1828778399 is a deficient number, since it is larger than the sum of its proper divisors (261852769).

1828778399 is an equidigital number, since it uses as much as digits as its factorization.

1828778399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74845.

The product of its digits is 12192768, while the sum is 62.

The square root of 1828778399 is about 42764.2186763654. The cubic root of 1828778399 is about 1222.8889698092. Note that the first 3 decimals are identical.

The spelling of 1828778399 in words is "one billion, eight hundred twenty-eight million, seven hundred seventy-eight thousand, three hundred ninety-nine".