1556949 has 4 divisors (see below), whose sum is σ = 2075936. Its totient is φ = 1037964.

The previous prime is 1556927. The next prime is 1556963. The reversal of 1556949 is 9496551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9496551 = 3 ⋅3165517.

It is not a de Polignac number, because 1556949 - 2¹⁵ = 1524181 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556909) 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, 259489 + ... + 259494.

It is an arithmetic number, because the mean of its divisors is an integer number (518984).

2^1556949 is an apocalyptic number.

It is an amenable number.

1556949 is a deficient number, since it is larger than the sum of its proper divisors (518987).

1556949 is an equidigital number, since it uses as much as digits as its factorization.

1556949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518986.

The product of its digits is 48600, while the sum is 39.

The square root of 1556949 is about 1247.7776244187. Note that the first 3 decimals coincide. The cubic root of 1556949 is about 115.9021420042.

The spelling of 1556949 in words is "one million, five hundred fifty-six thousand, nine hundred forty-nine".