1612643 has 4 divisors (see below), whose sum is σ = 1634808. Its totient is φ = 1590480.

The previous prime is 1612621. The next prime is 1612649. The reversal of 1612643 is 3462161.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1612643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1612649) 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 3 ways as a sum of consecutive naturals, for example, 10973 + ... + 11118.

It is an arithmetic number, because the mean of its divisors is an integer number (408702).

2^1612643 is an apocalyptic number.

1612643 is a deficient number, since it is larger than the sum of its proper divisors (22165).

1612643 is an equidigital number, since it uses as much as digits as its factorization.

1612643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22164.

The product of its digits is 864, while the sum is 23.

The square root of 1612643 is about 1269.8988148668. The cubic root of 1612643 is about 117.2679712650.

The spelling of 1612643 in words is "one million, six hundred twelve thousand, six hundred forty-three".