1989078 has 32 divisors (see below), whose sum is σ = 4897536. Its totient is φ = 524448.

The previous prime is 1989077. The next prime is 1989101. The reversal of 1989078 is 8709891.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989073) 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 15 ways as a sum of consecutive naturals, for example, 1276 + ... + 2367.

It is an arithmetic number, because the mean of its divisors is an integer number (153048).

2^1989078 is an apocalyptic number.

1989078 is an abundant number, since it is smaller than the sum of its proper divisors (2908458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1989078 is a wasteful number, since it uses less digits than its factorization.

1989078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3668.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1989078 is about 1410.3467658700. The cubic root of 1989078 is about 125.7623386007.

The spelling of 1989078 in words is "one million, nine hundred eighty-nine thousand, seventy-eight".