1427681 has 2 divisors, whose sum is σ = 1427682. Its totient is φ = 1427680.

The previous prime is 1427663. The next prime is 1427687. The reversal of 1427681 is 1867241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1018081 + 409600 = 1009^2 + 640^2 .

It is an emirp because it is prime and its reverse (1867241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1427681 - 2⁶ = 1427617 is a prime.

It is a super-2 number, since 2×1427681² = 4076546075522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1427687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713840 + 713841.

It is an arithmetic number, because the mean of its divisors is an integer number (713841).

2^1427681 is an apocalyptic number.

It is an amenable number.

1427681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1427681 is an equidigital number, since it uses as much as digits as its factorization.

1427681 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 1427681 is about 1194.8560582765. The cubic root of 1427681 is about 112.6013835042.

The spelling of 1427681 in words is "one million, four hundred twenty-seven thousand, six hundred eighty-one".