1854878989 has 4 divisors (see below), whose sum is σ = 1863197056. Its totient is φ = 1846560924.

The previous prime is 1854878983. The next prime is 1854879011. The reversal of 1854878989 is 9898784581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1854878989 - 2³ = 1854878981 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 (1854878981) 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 in 3 ways as a sum of consecutive naturals, for example, 4158699 + ... + 4159144.

It is an arithmetic number, because the mean of its divisors is an integer number (465799264).

Almost surely, 2^1854878989 is an apocalyptic number.

It is an amenable number.

1854878989 is a deficient number, since it is larger than the sum of its proper divisors (8318067).

1854878989 is an equidigital number, since it uses as much as digits as its factorization.

1854878989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8318066.

The product of its digits is 46448640, while the sum is 67.

The square root of 1854878989 is about 43068.3060846372. The cubic root of 1854878989 is about 1228.6792593983.

The spelling of 1854878989 in words is "one billion, eight hundred fifty-four million, eight hundred seventy-eight thousand, nine hundred eighty-nine".