1405643 has 2 divisors, whose sum is σ = 1405644. Its totient is φ = 1405642.

The previous prime is 1405637. The next prime is 1405669. The reversal of 1405643 is 3465041.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1405643 - 2⁸ = 1405387 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1405693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702821 + 702822.

It is an arithmetic number, because the mean of its divisors is an integer number (702822).

2^1405643 is an apocalyptic number.

1405643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405643 is an equidigital number, since it uses as much as digits as its factorization.

1405643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1405643 is about 1185.5981612671. The cubic root of 1405643 is about 112.0189965652.

It can be divided in two parts, 1405 and 643, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1405643 in words is "one million, four hundred five thousand, six hundred forty-three".