1290000 has 100 divisors (see below), whose sum is σ = 4261136. Its totient is φ = 336000.

The previous prime is 1289971. The next prime is 1290013. The reversal of 1290000 is 921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29979 + ... + 30021.

2^1290000 is an apocalyptic number.

1290000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1290000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2130568).

1290000 is an abundant number, since it is smaller than the sum of its proper divisors (2971136).

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

1290000 is an equidigital number, since it uses as much as digits as its factorization.

1290000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1290000 is about 1135.7816691601. The cubic root of 1290000 is about 108.8587233453.

Adding to 1290000 its reverse (921), we get a palindrome (1290921).

The spelling of 1290000 in words is "one million, two hundred ninety thousand".