1281528 has 64 divisors (see below), whose sum is σ = 3780000. Its totient is φ = 400896.

The previous prime is 1281523. The next prime is 1281541. The reversal of 1281528 is 8251821.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281521) 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, 3498 + ... + 3846.

2^1281528 is an apocalyptic number.

1281528 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 1281528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1890000).

1281528 is an abundant number, since it is smaller than the sum of its proper divisors (2498472).

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

1281528 is a wasteful number, since it uses less digits than its factorization.

1281528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 371 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 1281528 is about 1132.0459354638. The cubic root of 1281528 is about 108.6198919638.

The spelling of 1281528 in words is "one million, two hundred eighty-one thousand, five hundred twenty-eight".