1289628 has 24 divisors (see below), whose sum is σ = 3343760. Its totient is φ = 429840.

The previous prime is 1289627. The next prime is 1289653. The reversal of 1289628 is 8269821.

1289628 is a `hidden beast` number, since 1 + 28 + 9 + 628 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1289592 and 1289601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5863 + ... + 6078.

2^1289628 is an apocalyptic number.

1289628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1289628 is an abundant number, since it is smaller than the sum of its proper divisors (2054132).

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

1289628 is a wasteful number, since it uses less digits than its factorization.

1289628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11954 (or 11946 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 1289628 is about 1135.6178934835. The cubic root of 1289628 is about 108.8482584000.

The spelling of 1289628 in words is "one million, two hundred eighty-nine thousand, six hundred twenty-eight".