1257968345 has 8 divisors (see below), whose sum is σ = 1511484864. Its totient is φ = 1005092784.

The previous prime is 1257968333. The next prime is 1257968377. The reversal of 1257968345 is 5438697521.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1257968345 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1257968293 and 1257968302.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 155909 + ... + 163778.

It is an arithmetic number, because the mean of its divisors is an integer number (188935608).

Almost surely, 2^1257968345 is an apocalyptic number.

It is an amenable number.

1257968345 is a deficient number, since it is larger than the sum of its proper divisors (253516519).

1257968345 is an equidigital number, since it uses as much as digits as its factorization.

1257968345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320479.

The product of its digits is 1814400, while the sum is 50.

The square root of 1257968345 is about 35467.8494555280. The cubic root of 1257968345 is about 1079.5014688718.

The spelling of 1257968345 in words is "one billion, two hundred fifty-seven million, nine hundred sixty-eight thousand, three hundred forty-five".