1878989 has 8 divisors (see below), whose sum is σ = 2200128. Its totient is φ = 1571040.

The previous prime is 1878979. The next prime is 1878991. The reversal of 1878989 is 9898781.

It is a happy number.

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 1878989 - 2⁸ = 1878733 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1878949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2987 + ... + 3560.

It is an arithmetic number, because the mean of its divisors is an integer number (275016).

2^1878989 is an apocalyptic number.

It is an amenable number.

1878989 is a deficient number, since it is larger than the sum of its proper divisors (321139).

1878989 is an equidigital number, since it uses as much as digits as its factorization.

1878989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6595.

The product of its digits is 290304, while the sum is 50.

The square root of 1878989 is about 1370.7621967358. The cubic root of 1878989 is about 123.3979881763.

The spelling of 1878989 in words is "one million, eight hundred seventy-eight thousand, nine hundred eighty-nine".