1555984 has 20 divisors (see below), whose sum is σ = 3055360. Its totient is φ = 767520.

The previous prime is 1555969. The next prime is 1555997. The reversal of 1555984 is 4895551.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 649 + ... + 1879.

It is an arithmetic number, because the mean of its divisors is an integer number (152768).

2^1555984 is an apocalyptic number.

It is an amenable number.

1555984 is a deficient number, since it is larger than the sum of its proper divisors (1499376).

1555984 is a wasteful number, since it uses less digits than its factorization.

1555984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318 (or 1312 counting only the distinct ones).

The product of its digits is 36000, while the sum is 37.

The square root of 1555984 is about 1247.3908769908. The cubic root of 1555984 is about 115.8781915981.

It can be divided in two parts, 1 and 555984, that added together give a triangular number (555985 = T₁₀₅₄).

The spelling of 1555984 in words is "one million, five hundred fifty-five thousand, nine hundred eighty-four".