1798278489 has 36 divisors (see below), whose sum is σ = 3133528944. Its totient is φ = 1027580904.

The previous prime is 1798278457. The next prime is 1798278509. The reversal of 1798278489 is 9848728971.

1798278489 is a `hidden beast` number, since 1 + 7 + 9 + 82 + 78 + 489 = 666.

It is not a de Polignac number, because 1798278489 - 2⁵ = 1798278457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1798278089) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 63607 + ... + 87420.

Almost surely, 2^1798278489 is an apocalyptic number.

It is an amenable number.

1798278489 is a deficient number, since it is larger than the sum of its proper divisors (1335250455).

1798278489 is an equidigital number, since it uses as much as digits as its factorization.

1798278489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151056 (or 151037 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 63.

The square root of 1798278489 is about 42406.1138162883. The cubic root of 1798278489 is about 1216.0524762474.

The spelling of 1798278489 in words is "one billion, seven hundred ninety-eight million, two hundred seventy-eight thousand, four hundred eighty-nine".