1257257423 has 4 divisors (see below), whose sum is σ = 1331213760. Its totient is φ = 1183301088.

The previous prime is 1257257401. The next prime is 1257257431. The reversal of 1257257423 is 3247527521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1257257423 - 2⁸ = 1257257167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257257123) 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, 36978143 + ... + 36978176.

It is an arithmetic number, because the mean of its divisors is an integer number (332803440).

Almost surely, 2^1257257423 is an apocalyptic number.

1257257423 is a deficient number, since it is larger than the sum of its proper divisors (73956337).

1257257423 is an equidigital number, since it uses as much as digits as its factorization.

1257257423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73956336.

The product of its digits is 117600, while the sum is 38.

The square root of 1257257423 is about 35457.8259767854. The cubic root of 1257257423 is about 1079.2980758476.

The spelling of 1257257423 in words is "one billion, two hundred fifty-seven million, two hundred fifty-seven thousand, four hundred twenty-three".