1556143 has 4 divisors (see below), whose sum is σ = 1559968. Its totient is φ = 1552320.

The previous prime is 1556117. The next prime is 1556147. The reversal of 1556143 is 3416551.

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 1556143 - 2¹³ = 1547951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556147) 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, 1218 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (389992).

2^1556143 is an apocalyptic number.

1556143 is a deficient number, since it is larger than the sum of its proper divisors (3825).

1556143 is an equidigital number, since it uses as much as digits as its factorization.

1556143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3824.

The product of its digits is 1800, while the sum is 25.

The square root of 1556143 is about 1247.4546083926. The cubic root of 1556143 is about 115.8821385120.

The spelling of 1556143 in words is "one million, five hundred fifty-six thousand, one hundred forty-three".