1899481 has 2 divisors, whose sum is σ = 1899482. Its totient is φ = 1899480.

The previous prime is 1899473. The next prime is 1899497. The reversal of 1899481 is 1849981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 968256 + 931225 = 984^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 1899481 - 2³ = 1899473 is a prime.

It is a super-2 number, since 2×1899481² = 7216056138722, which contains 22 as substring.

It is a Chen prime.

1899481 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1899421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949740 + 949741.

It is an arithmetic number, because the mean of its divisors is an integer number (949741).

2^1899481 is an apocalyptic number.

It is an amenable number.

1899481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1899481 is an equidigital number, since it uses as much as digits as its factorization.

1899481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 40.

The square root of 1899481 is about 1378.2166012641. The cubic root of 1899481 is about 123.8449545001.

It can be divided in two parts, 18 and 99481, that added together give a palindrome (99499).

The spelling of 1899481 in words is "one million, eight hundred ninety-nine thousand, four hundred eighty-one".