1280988 has 48 divisors (see below), whose sum is σ = 3444000. Its totient is φ = 411264.

The previous prime is 1280987. The next prime is 1280989. The reversal of 1280988 is 8890821.

It is an interprime number because it is at equal distance from previous prime (1280987) and next prime (1280989).

It is a super-2 number, since 2×1280988² = 3281860512288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2928 + ... + 3336.

It is an arithmetic number, because the mean of its divisors is an integer number (71750).

2^1280988 is an apocalyptic number.

1280988 is a gapful number since it is divisible by the number (18) 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 1280988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1722000).

1280988 is an abundant number, since it is smaller than the sum of its proper divisors (2163012).

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

1280988 is a wasteful number, since it uses less digits than its factorization.

1280988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1280988 is about 1131.8074041108. The cubic root of 1280988 is about 108.6046333605.

The spelling of 1280988 in words is "one million, two hundred eighty thousand, nine hundred eighty-eight".