388441431057 has 4 divisors (see below), whose sum is σ = 517921908080. Its totient is φ = 258960954036.

The previous prime is 388441431023. The next prime is 388441431083. The reversal of 388441431057 is 750134144883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 750134144883 = 3 ⋅250044714961.

It is not a de Polignac number, because 388441431057 - 2³² = 384146463761 is a prime.

It is a super-2 number, since 2×388441431057² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 388441430997 and 388441431015.

It is not an unprimeable number, because it can be changed into a prime (388441421057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64740238507 + ... + 64740238512.

It is an arithmetic number, because the mean of its divisors is an integer number (129480477020).

Almost surely, 2^388441431057 is an apocalyptic number.

It is an amenable number.

388441431057 is a deficient number, since it is larger than the sum of its proper divisors (129480477023).

388441431057 is a wasteful number, since it uses less digits than its factorization.

388441431057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129480477022.

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 388441431057 in words is "three hundred eighty-eight billion, four hundred forty-one million, four hundred thirty-one thousand, fifty-seven".