1257423423 has 4 divisors (see below), whose sum is σ = 1676564568. Its totient is φ = 838282280.

The previous prime is 1257423373. The next prime is 1257423443. The reversal of 1257423423 is 3243247521.

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 1257423423 - 2⁶ = 1257423359 is a prime.

It is a super-2 number, since 2×1257423423² = 3162227329418073858, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257423443) 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, 209570568 + ... + 209570573.

It is an arithmetic number, because the mean of its divisors is an integer number (419141142).

Almost surely, 2^1257423423 is an apocalyptic number.

1257423423 is a deficient number, since it is larger than the sum of its proper divisors (419141145).

1257423423 is an equidigital number, since it uses as much as digits as its factorization.

1257423423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419141144.

The product of its digits is 40320, while the sum is 33.

The square root of 1257423423 is about 35460.1667085760. The cubic root of 1257423423 is about 1079.3455748966.

The spelling of 1257423423 in words is "one billion, two hundred fifty-seven million, four hundred twenty-three thousand, four hundred twenty-three".