1656003 has 4 divisors (see below), whose sum is σ = 2208008. Its totient is φ = 1104000.

The previous prime is 1655999. The next prime is 1656007. The reversal of 1656003 is 3006561.

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

It is an interprime number because it is at equal distance from previous prime (1655999) and next prime (1656007).

It is not a de Polignac number, because 1656003 - 2² = 1655999 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1656007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275998 + ... + 276003.

It is an arithmetic number, because the mean of its divisors is an integer number (552002).

2^1656003 is an apocalyptic number.

1656003 is a deficient number, since it is larger than the sum of its proper divisors (552005).

1656003 is an equidigital number, since it uses as much as digits as its factorization.

1656003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552004.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1656003 is about 1286.8578010021. The cubic root of 1656003 is about 118.3097054370.

The spelling of 1656003 in words is "one million, six hundred fifty-six thousand, three".