1209990 has 32 divisors (see below), whose sum is σ = 2962656. Its totient is φ = 316160.

The previous prime is 1209979. The next prime is 1210003. The reversal of 1209990 is 999021.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1210 + ... + 1970.

It is an arithmetic number, because the mean of its divisors is an integer number (92583).

2^1209990 is an apocalyptic number.

1209990 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 1209990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1481328).

1209990 is an abundant number, since it is smaller than the sum of its proper divisors (1752666).

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

1209990 is a wasteful number, since it uses less digits than its factorization.

1209990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 1209990 is about 1099.9954545361. The cubic root of 1209990 is about 106.5599301215.

The spelling of 1209990 in words is "one million, two hundred nine thousand, nine hundred ninety".