1827990 has 48 divisors (see below), whose sum is σ = 5007600. Its totient is φ = 461376.

The previous prime is 1827983. The next prime is 1828003. The reversal of 1827990 is 997281.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1176 + ... + 2244.

It is an arithmetic number, because the mean of its divisors is an integer number (104325).

2^1827990 is an apocalyptic number.

1827990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1827990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2503800).

1827990 is an abundant number, since it is smaller than the sum of its proper divisors (3179610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1827990 is a wasteful number, since it uses less digits than its factorization.

1827990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1098 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1827990 is about 1352.0318043596. The cubic root of 1827990 is about 122.2713212589.

The spelling of 1827990 in words is "one million, eight hundred twenty-seven thousand, nine hundred ninety".