1288629 has 12 divisors (see below), whose sum is σ = 1930656. Its totient is φ = 858924.

The previous prime is 1288613. The next prime is 1288643. The reversal of 1288629 is 9268821.

1288629 is a `hidden beast` number, since 1 + 28 + 8 + 629 = 666.

It is not a de Polignac number, because 1288629 - 2⁴ = 1288613 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1288593 and 1288602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2409 + ... + 2894.

It is an arithmetic number, because the mean of its divisors is an integer number (160888).

2^1288629 is an apocalyptic number.

It is an amenable number.

1288629 is a deficient number, since it is larger than the sum of its proper divisors (642027).

1288629 is an frugal number, since it uses more digits than its factorization.

1288629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318 (or 5306 counting only the distinct ones).

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

The square root of 1288629 is about 1135.1779596169. The cubic root of 1288629 is about 108.8201449956.

The spelling of 1288629 in words is "one million, two hundred eighty-eight thousand, six hundred twenty-nine".