1989854 has 4 divisors (see below), whose sum is σ = 2984784. Its totient is φ = 994926.

The previous prime is 1989847. The next prime is 1989863. The reversal of 1989854 is 4589891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4589891 = 31 ⋅148061.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497462 + ... + 497465.

It is an arithmetic number, because the mean of its divisors is an integer number (746196).

2^1989854 is an apocalyptic number.

1989854 is a deficient number, since it is larger than the sum of its proper divisors (994930).

1989854 is an equidigital number, since it uses as much as digits as its factorization.

1989854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994929.

The product of its digits is 103680, while the sum is 44.

The square root of 1989854 is about 1410.6218486894. The cubic root of 1989854 is about 125.7786910491.

The spelling of 1989854 in words is "one million, nine hundred eighty-nine thousand, eight hundred fifty-four".