1928989 has 2 divisors, whose sum is σ = 1928990. Its totient is φ = 1928988.

The previous prime is 1928963. The next prime is 1929043. The reversal of 1928989 is 9898291.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1776889 + 152100 = 1333^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1928989 - 2⁵ = 1928957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1928929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964494 + 964495.

It is an arithmetic number, because the mean of its divisors is an integer number (964495).

2^1928989 is an apocalyptic number.

It is an amenable number.

1928989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928989 is an equidigital number, since it uses as much as digits as its factorization.

1928989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 46.

The square root of 1928989 is about 1388.8804844190. The cubic root of 1928989 is about 124.4829629972.

The spelling of 1928989 in words is "one million, nine hundred twenty-eight thousand, nine hundred eighty-nine".