1257448438 has 4 divisors (see below), whose sum is σ = 1886172660. Its totient is φ = 628724218.

The previous prime is 1257448421. The next prime is 1257448459. The reversal of 1257448438 is 8348447521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8348447521 = 47 ⋅177626543.

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, 314362108 + ... + 314362111.

It is an arithmetic number, because the mean of its divisors is an integer number (471543165).

Almost surely, 2^1257448438 is an apocalyptic number.

1257448438 is a deficient number, since it is larger than the sum of its proper divisors (628724222).

1257448438 is an equidigital number, since it uses as much as digits as its factorization.

1257448438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628724221.

The product of its digits is 860160, while the sum is 46.

The square root of 1257448438 is about 35460.5194265397. The cubic root of 1257448438 is about 1079.3527322975.

The spelling of 1257448438 in words is "one billion, two hundred fifty-seven million, four hundred forty-eight thousand, four hundred thirty-eight".