1989279 has 20 divisors (see below), whose sum is σ = 3049200. Its totient is φ = 1291680.

The previous prime is 1989277. The next prime is 1989307. The reversal of 1989279 is 9729891.

It is not a de Polignac number, because 1989279 - 2¹ = 1989277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989277) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3022 + ... + 3620.

It is an arithmetic number, because the mean of its divisors is an integer number (152460).

2^1989279 is an apocalyptic number.

1989279 is a deficient number, since it is larger than the sum of its proper divisors (1059921).

1989279 is an equidigital number, since it uses as much as digits as its factorization.

1989279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 643 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 1989279 is about 1410.4180231407. The cubic root of 1989279 is about 125.7665746301.

It can be divided in two parts, 1989 and 279, that multiplied together give a triangular number (554931 = T₁₀₅₃).

The spelling of 1989279 in words is "one million, nine hundred eighty-nine thousand, two hundred seventy-nine".