1257908422 has 4 divisors (see below), whose sum is σ = 1886862636. Its totient is φ = 628954210.

The previous prime is 1257908401. The next prime is 1257908459. The reversal of 1257908422 is 2248097521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2248097521 = 7867 ⋅285763.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314477104 + ... + 314477107.

It is an arithmetic number, because the mean of its divisors is an integer number (471715659).

Almost surely, 2^1257908422 is an apocalyptic number.

1257908422 is a deficient number, since it is larger than the sum of its proper divisors (628954214).

1257908422 is an equidigital number, since it uses as much as digits as its factorization.

1257908422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628954213.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 1257908422 is about 35467.0046945044. The cubic root of 1257908422 is about 1079.4843280076.

The spelling of 1257908422 in words is "one billion, two hundred fifty-seven million, nine hundred eight thousand, four hundred twenty-two".