1990550 has 24 divisors (see below), whose sum is σ = 3796632. Its totient is φ = 776000.

The previous prime is 1990543. The next prime is 1990553. The reversal of 1990550 is 550991.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1565 + ... + 2535.

It is an arithmetic number, because the mean of its divisors is an integer number (158193).

2^1990550 is an apocalyptic number.

1990550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1990550 is a deficient number, since it is larger than the sum of its proper divisors (1806082).

1990550 is a wasteful number, since it uses less digits than its factorization.

1990550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1019 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 29.

The square root of 1990550 is about 1410.8685268302. The cubic root of 1990550 is about 125.7933540620.

The spelling of 1990550 in words is "one million, nine hundred ninety thousand, five hundred fifty".