1257448409 has 4 divisors (see below), whose sum is σ = 1437083904. Its totient is φ = 1077812916.

The previous prime is 1257448369. The next prime is 1257448417. The reversal of 1257448409 is 9048447521.

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 1257448409 - 2¹⁶ = 1257382873 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 1257448409.

It is not an unprimeable number, because it can be changed into a prime (1257448459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89817737 + ... + 89817750.

It is an arithmetic number, because the mean of its divisors is an integer number (359270976).

Almost surely, 2^1257448409 is an apocalyptic number.

It is an amenable number.

1257448409 is a deficient number, since it is larger than the sum of its proper divisors (179635495).

1257448409 is an equidigital number, since it uses as much as digits as its factorization.

1257448409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179635494.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 1257448409 is about 35460.5190176342. The cubic root of 1257448409 is about 1079.3527240000.

The spelling of 1257448409 in words is "one billion, two hundred fifty-seven million, four hundred forty-eight thousand, four hundred nine".