1542643 has 4 divisors (see below), whose sum is σ = 1545280. Its totient is φ = 1540008.

The previous prime is 1542599. The next prime is 1542661. The reversal of 1542643 is 3462451.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1542643 - 2⁹ = 1542131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1542043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3 + ... + 1756.

It is an arithmetic number, because the mean of its divisors is an integer number (386320).

2^1542643 is an apocalyptic number.

1542643 is a deficient number, since it is larger than the sum of its proper divisors (2637).

1542643 is an equidigital number, since it uses as much as digits as its factorization.

1542643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636.

The product of its digits is 2880, while the sum is 25.

The square root of 1542643 is about 1242.0318031355. The cubic root of 1542643 is about 115.5460608501.

The spelling of 1542643 in words is "one million, five hundred forty-two thousand, six hundred forty-three".