1550855 has 16 divisors (see below), whose sum is σ = 1953504. Its totient is φ = 1180800.

The previous prime is 1550851. The next prime is 1550873. The reversal of 1550855 is 5580551.

It is not a de Polignac number, because 1550855 - 2² = 1550851 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 (1550851) 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 15 ways as a sum of consecutive naturals, for example, 15305 + ... + 15405.

It is an arithmetic number, because the mean of its divisors is an integer number (122094).

2^1550855 is an apocalyptic number.

1550855 is a deficient number, since it is larger than the sum of its proper divisors (402649).

1550855 is a wasteful number, since it uses less digits than its factorization.

With its successor (1550856) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (226).

1550855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226.

The product of its (nonzero) digits is 5000, while the sum is 29.

The square root of 1550855 is about 1245.3332887223. Note that the first 3 decimals coincide. The cubic root of 1550855 is about 115.7507281013.

The spelling of 1550855 in words is "one million, five hundred fifty thousand, eight hundred fifty-five".