1320657 has 8 divisors (see below), whose sum is σ = 1896384. Its totient is φ = 812688.

The previous prime is 1320623. The next prime is 1320667. The reversal of 1320657 is 7560231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1320657 - 2¹¹ = 1318609 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 16893 + ... + 16970.

It is an arithmetic number, because the mean of its divisors is an integer number (237048).

2^1320657 is an apocalyptic number.

It is an amenable number.

1320657 is a deficient number, since it is larger than the sum of its proper divisors (575727).

1320657 is a wasteful number, since it uses less digits than its factorization.

1320657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33879.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 1320657 is about 1149.1984162885. The cubic root of 1320657 is about 109.7143276154.

Adding to 1320657 its reverse (7560231), we get a palindrome (8880888).

The spelling of 1320657 in words is "one million, three hundred twenty thousand, six hundred fifty-seven".