1405681 has 2 divisors, whose sum is σ = 1405682. Its totient is φ = 1405680.

The previous prime is 1405669. The next prime is 1405693. The reversal of 1405681 is 1865041.

It is a balanced prime because it is at equal distance from previous prime (1405669) and next prime (1405693).

It can be written as a sum of positive squares in only one way, i.e., 893025 + 512656 = 945^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405681 - 2¹⁵ = 1372913 is a prime.

It is a super-2 number, since 2×1405681² = 3951878147522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1405631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702840 + 702841.

It is an arithmetic number, because the mean of its divisors is an integer number (702841).

2^1405681 is an apocalyptic number.

It is an amenable number.

1405681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405681 is an equidigital number, since it uses as much as digits as its factorization.

1405681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1405681 is about 1185.6141868247. The cubic root of 1405681 is about 112.0200059925.

The spelling of 1405681 in words is "one million, four hundred five thousand, six hundred eighty-one".