1406561 has 8 divisors (see below), whose sum is σ = 1524264. Its totient is φ = 1290240.

The previous prime is 1406557. The next prime is 1406591. The reversal of 1406561 is 1656041.

It can be written as a sum of positive squares in 4 ways, for example, as 40000 + 1366561 = 200^2 + 1169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1406561 - 2² = 1406557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1406521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3131 + ... + 3551.

It is an arithmetic number, because the mean of its divisors is an integer number (190533).

2^1406561 is an apocalyptic number.

It is an amenable number.

1406561 is a deficient number, since it is larger than the sum of its proper divisors (117703).

1406561 is a wasteful number, since it uses less digits than its factorization.

1406561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1406561 is about 1185.9852444276. The cubic root of 1406561 is about 112.0433771181.

The spelling of 1406561 in words is "one million, four hundred six thousand, five hundred sixty-one".