1556023 has 4 divisors (see below), whose sum is σ = 1778320. Its totient is φ = 1333728.

The previous prime is 1556017. The next prime is 1556039. The reversal of 1556023 is 3206551.

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-1556023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1555985 and 1556003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556003) 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, 111138 + ... + 111151.

It is an arithmetic number, because the mean of its divisors is an integer number (444580).

2^1556023 is an apocalyptic number.

1556023 is a deficient number, since it is larger than the sum of its proper divisors (222297).

1556023 is an equidigital number, since it uses as much as digits as its factorization.

1556023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222296.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 1556023 is about 1247.4065095229. The cubic root of 1556023 is about 115.8791597339.

The spelling of 1556023 in words is "one million, five hundred fifty-six thousand, twenty-three".