1426781 has 2 divisors, whose sum is σ = 1426782. Its totient is φ = 1426780.

The previous prime is 1426753. The next prime is 1426801. The reversal of 1426781 is 1876241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 737881 + 688900 = 859^2 + 830^2 .

It is an emirp because it is prime and its reverse (1876241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1426781 - 2⁶ = 1426717 is a prime.

It is a super-2 number, since 2×1426781² = 4071408043922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1426741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713390 + 713391.

It is an arithmetic number, because the mean of its divisors is an integer number (713391).

2^1426781 is an apocalyptic number.

It is an amenable number.

1426781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1426781 is an equidigital number, since it uses as much as digits as its factorization.

1426781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 29.

The square root of 1426781 is about 1194.4793845019. The cubic root of 1426781 is about 112.5777174921.

The spelling of 1426781 in words is "one million, four hundred twenty-six thousand, seven hundred eighty-one".