1143990 has 64 divisors (see below), whose sum is σ = 3225600. Its totient is φ = 287712.

The previous prime is 1143977. The next prime is 1144001. The reversal of 1143990 is 993411.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 5019 + ... + 5241.

It is an arithmetic number, because the mean of its divisors is an integer number (50400).

2^1143990 is an apocalyptic number.

1143990 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 1143990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612800).

1143990 is an abundant number, since it is smaller than the sum of its proper divisors (2081610).

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

1143990 is a wasteful number, since it uses less digits than its factorization.

1143990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1143990 is about 1069.5746818245. The cubic root of 1143990 is about 104.5861258952.

The spelling of 1143990 in words is "one million, one hundred forty-three thousand, nine hundred ninety".