384557431 has 4 divisors (see below), whose sum is σ = 392739552. Its totient is φ = 376375312.

The previous prime is 384557423. The next prime is 384557461. The reversal of 384557431 is 134755483.

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 384557431 - 2³ = 384557423 is a prime.

It is a super-2 number, since 2×384557431² = 295768835474639522, which contains 22 as substring.

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 Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384557461) 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, 4090990 + ... + 4091083.

It is an arithmetic number, because the mean of its divisors is an integer number (98184888).

Almost surely, 2^384557431 is an apocalyptic number.

384557431 is a deficient number, since it is larger than the sum of its proper divisors (8182121).

384557431 is an equidigital number, since it uses as much as digits as its factorization.

384557431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8182120.

The product of its digits is 201600, while the sum is 40.

The square root of 384557431 is about 19610.1359250771. The cubic root of 384557431 is about 727.1997751924.

The spelling of 384557431 in words is "three hundred eighty-four million, five hundred fifty-seven thousand, four hundred thirty-one".