1896781 has 2 divisors, whose sum is σ = 1896782. Its totient is φ = 1896780.

The previous prime is 1896767. The next prime is 1896823. The reversal of 1896781 is 1876981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 19881 = 1370^2 + 141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1896781 - 2⁹ = 1896269 is a prime.

It is a super-2 number, since 2×1896781² = 7195556323922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1896721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948390 + 948391.

It is an arithmetic number, because the mean of its divisors is an integer number (948391).

2^1896781 is an apocalyptic number.

It is an amenable number.

1896781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1896781 is an equidigital number, since it uses as much as digits as its factorization.

1896781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The square root of 1896781 is about 1377.2367262021. The cubic root of 1896781 is about 123.7862472467.

The spelling of 1896781 in words is "one million, eight hundred ninety-six thousand, seven hundred eighty-one".