1898621 has 2 divisors, whose sum is σ = 1898622. Its totient is φ = 1898620.

The previous prime is 1898609. The next prime is 1898629. The reversal of 1898621 is 1268981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1428025 + 470596 = 1195^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898621 - 2⁶ = 1898557 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 (1898629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949310 + 949311.

It is an arithmetic number, because the mean of its divisors is an integer number (949311).

2^1898621 is an apocalyptic number.

It is an amenable number.

1898621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898621 is an equidigital number, since it uses as much as digits as its factorization.

1898621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 35.

The square root of 1898621 is about 1377.9045685388. The cubic root of 1898621 is about 123.8262611941.

The spelling of 1898621 in words is "one million, eight hundred ninety-eight thousand, six hundred twenty-one".