1928261 has 2 divisors, whose sum is σ = 1928262. Its totient is φ = 1928260.

The previous prime is 1928257. The next prime is 1928287. The reversal of 1928261 is 1628291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1890625 + 37636 = 1375^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1928261 - 2² = 1928257 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1928161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964130 + 964131.

It is an arithmetic number, because the mean of its divisors is an integer number (964131).

2^1928261 is an apocalyptic number.

It is an amenable number.

1928261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928261 is an equidigital number, since it uses as much as digits as its factorization.

1928261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 1928261 is about 1388.6183781011. The cubic root of 1928261 is about 124.4673010797.

The spelling of 1928261 in words is "one million, nine hundred twenty-eight thousand, two hundred sixty-one".