1320847457 has 4 divisors (see below), whose sum is σ = 1342500756. Its totient is φ = 1299194160.

The previous prime is 1320847441. The next prime is 1320847477. The reversal of 1320847457 is 7547480231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 473106001 + 847741456 = 21751^2 + 29116^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320847457 - 2⁴ = 1320847441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320847477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10826558 + ... + 10826679.

It is an arithmetic number, because the mean of its divisors is an integer number (335625189).

Almost surely, 2^1320847457 is an apocalyptic number.

It is an amenable number.

1320847457 is a deficient number, since it is larger than the sum of its proper divisors (21653299).

1320847457 is an equidigital number, since it uses as much as digits as its factorization.

1320847457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21653298.

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 1320847457 is about 36343.4651209815. The cubic root of 1320847457 is about 1097.1960146956.

The spelling of 1320847457 in words is "one billion, three hundred twenty million, eight hundred forty-seven thousand, four hundred fifty-seven".