1320687 has 6 divisors (see below), whose sum is σ = 1907672. Its totient is φ = 880452.

The previous prime is 1320667. The next prime is 1320721. The reversal of 1320687 is 7860231.

It is not a de Polignac number, because 1320687 - 2⁶ = 1320623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73363 + ... + 73380.

2^1320687 is an apocalyptic number.

1320687 is a deficient number, since it is larger than the sum of its proper divisors (586985).

1320687 is a wasteful number, since it uses less digits than its factorization.

1320687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146749 (or 146746 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1320687 is about 1149.2114687907. The cubic root of 1320687 is about 109.7151583648.

The spelling of 1320687 in words is "one million, three hundred twenty thousand, six hundred eighty-seven".