1550989 has 16 divisors (see below), whose sum is σ = 1834560. Its totient is φ = 1296000.

The previous prime is 1550971. The next prime is 1550993. The reversal of 1550989 is 9890551.

It is a cyclic number.

It is not a de Polignac number, because 1550989 - 2⁹ = 1550477 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 (1550999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8479 + ... + 8659.

It is an arithmetic number, because the mean of its divisors is an integer number (114660).

2^1550989 is an apocalyptic number.

1550989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1550989 is a deficient number, since it is larger than the sum of its proper divisors (283571).

1550989 is a wasteful number, since it uses less digits than its factorization.

1550989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 1550989 is about 1245.3870884187. The cubic root of 1550989 is about 115.7540617787.

The spelling of 1550989 in words is "one million, five hundred fifty thousand, nine hundred eighty-nine".