1289616 has 40 divisors (see below), whose sum is σ = 3389664. Its totient is φ = 422400.

The previous prime is 1289599. The next prime is 1289621. The reversal of 1289616 is 6169821.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3016 + ... + 3416.

2^1289616 is an apocalyptic number.

1289616 is a gapful number since it is divisible by the number (16) 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 1289616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1694832).

1289616 is an abundant number, since it is smaller than the sum of its proper divisors (2100048).

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

1289616 is a wasteful number, since it uses less digits than its factorization.

1289616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 473 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 1289616 is about 1135.6126100040. The cubic root of 1289616 is about 108.8479207876.

The spelling of 1289616 in words is "one million, two hundred eighty-nine thousand, six hundred sixteen".