1290280 has 16 divisors (see below), whose sum is σ = 2903220. Its totient is φ = 516096.

The previous prime is 1290259. The next prime is 1290287. The reversal of 1290280 is 820921.

It can be written as a sum of positive squares in 2 ways, for example, as 1240996 + 49284 = 1114^2 + 222^2 .

It is not an unprimeable number, because it can be changed into a prime (1290287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16089 + ... + 16168.

2^1290280 is an apocalyptic number.

1290280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1290280 is an abundant number, since it is smaller than the sum of its proper divisors (1612940).

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

1290280 is a wasteful number, since it uses less digits than its factorization.

1290280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32268 (or 32264 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1290280 is about 1135.9049255990. The cubic root of 1290280 is about 108.8665988589.

The spelling of 1290280 in words is "one million, two hundred ninety thousand, two hundred eighty".