1957480809 has 4 divisors (see below), whose sum is σ = 2609974416. Its totient is φ = 1304987204.

The previous prime is 1957480783. The next prime is 1957480817. The reversal of 1957480809 is 9080847591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1957480809 - 2¹⁵ = 1957448041 is a prime.

It is a super-2 number, since 2×1957480809² = 7663462235206588962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1957480829) 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, 326246799 + ... + 326246804.

It is an arithmetic number, because the mean of its divisors is an integer number (652493604).

Almost surely, 2^1957480809 is an apocalyptic number.

It is an amenable number.

1957480809 is a deficient number, since it is larger than the sum of its proper divisors (652493607).

1957480809 is an equidigital number, since it uses as much as digits as its factorization.

1957480809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652493606.

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 1957480809 is about 44243.4267321147. The cubic root of 1957480809 is about 1250.9285493195.

The spelling of 1957480809 in words is "one billion, nine hundred fifty-seven million, four hundred eighty thousand, eight hundred nine".