1289630 has 16 divisors (see below), whose sum is σ = 2401920. Its totient is φ = 497952.

The previous prime is 1289627. The next prime is 1289653. The reversal of 1289630 is 369821.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 1289593 and 1289602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1934 + ... + 2513.

It is an arithmetic number, because the mean of its divisors is an integer number (150120).

2^1289630 is an apocalyptic number.

1289630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1289630 is a deficient number, since it is larger than the sum of its proper divisors (1112290).

1289630 is a wasteful number, since it uses less digits than its factorization.

1289630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4483.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1289630 is about 1135.6187740611. The cubic root of 1289630 is about 108.8483146685.

The spelling of 1289630 in words is "one million, two hundred eighty-nine thousand, six hundred thirty".