1406521 has 2 divisors, whose sum is σ = 1406522. Its totient is φ = 1406520.

The previous prime is 1406497. The next prime is 1406533. The reversal of 1406521 is 1256041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1022121 + 384400 = 1011^2 + 620^2 .

It is an emirp because it is prime and its reverse (1256041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1406521 - 2¹³ = 1398329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1406591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703260 + 703261.

It is an arithmetic number, because the mean of its divisors is an integer number (703261).

2^1406521 is an apocalyptic number.

It is an amenable number.

1406521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1406521 is an equidigital number, since it uses as much as digits as its factorization.

1406521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1406521 is about 1185.9683806915. The cubic root of 1406521 is about 112.0423150057.

The spelling of 1406521 in words is "one million, four hundred six thousand, five hundred twenty-one".