1928813 has 2 divisors, whose sum is σ = 1928814. Its totient is φ = 1928812.

The previous prime is 1928809. The next prime is 1928821. The reversal of 1928813 is 3188291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1898884 + 29929 = 1378^2 + 173^2 .

It is an emirp because it is prime and its reverse (3188291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1928813 - 2² = 1928809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1928813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1928873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964406 + 964407.

It is an arithmetic number, because the mean of its divisors is an integer number (964407).

2^1928813 is an apocalyptic number.

It is an amenable number.

1928813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928813 is an equidigital number, since it uses as much as digits as its factorization.

1928813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 1928813 is about 1388.8171225903. The cubic root of 1928813 is about 124.4791769608.

The spelling of 1928813 in words is "one million, nine hundred twenty-eight thousand, eight hundred thirteen".