1290900 has 72 divisors (see below), whose sum is σ = 4034464. Its totient is φ = 316800.

The previous prime is 1290869. The next prime is 1290901. The reversal of 1290900 is 90921.

It is a happy number.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3735 + ... + 4065.

2^1290900 is an apocalyptic number.

1290900 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 1290900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2017232).

1290900 is an abundant number, since it is smaller than the sum of its proper divisors (2743564).

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

1290900 is a wasteful number, since it uses less digits than its factorization.

1290900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 1290900 is about 1136.1778029868. The cubic root of 1290900 is about 108.8840334423.

Adding to 1290900 its sum of digits (21), we get a palindrome (1290921).

The spelling of 1290900 in words is "one million, two hundred ninety thousand, nine hundred".