1928621 has 2 divisors, whose sum is σ = 1928622. Its totient is φ = 1928620.

The previous prime is 1928569. The next prime is 1928623. The reversal of 1928621 is 1268291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1716100 + 212521 = 1310^2 + 461^2 .

It is an emirp because it is prime and its reverse (1268291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1928621 - 2¹⁸ = 1666477 is a prime.

Together with 1928623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1928623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964310 + 964311.

It is an arithmetic number, because the mean of its divisors is an integer number (964311).

2^1928621 is an apocalyptic number.

It is an amenable number.

1928621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928621 is an equidigital number, since it uses as much as digits as its factorization.

1928621 is an evil number, because the sum of its binary digits is even.

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

The square root of 1928621 is about 1388.7479972983. The cubic root of 1928621 is about 124.4750464766.

The spelling of 1928621 in words is "one million, nine hundred twenty-eight thousand, six hundred twenty-one".