1320424657 has 6 divisors (see below), whose sum is σ = 1338827462. Its totient is φ = 1302030432.

The previous prime is 1320424643. The next prime is 1320424691. The reversal of 1320424657 is 7564240231.

It can be written as a sum of positive squares in 3 ways, for example, as 1354896 + 1319069761 = 1164^2 + 36319^2 .

It is not a de Polignac number, because 1320424657 - 2¹⁹ = 1319900369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320425657) 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, 308343 + ... + 312595.

Almost surely, 2^1320424657 is an apocalyptic number.

It is an amenable number.

1320424657 is a deficient number, since it is larger than the sum of its proper divisors (18402805).

1320424657 is an frugal number, since it uses more digits than its factorization.

1320424657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8579 (or 4326 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 1320424657 is about 36337.6479288355. The cubic root of 1320424657 is about 1097.0789322931.

Adding to 1320424657 its reverse (7564240231), we get a palindrome (8884664888).

The spelling of 1320424657 in words is "one billion, three hundred twenty million, four hundred twenty-four thousand, six hundred fifty-seven".