384157021 has 4 divisors (see below), whose sum is σ = 384212700. Its totient is φ = 384101344.

The previous prime is 384157009. The next prime is 384157049. The reversal of 384157021 is 120751483.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67815225 + 316341796 = 8235^2 + 17786^2 .

It is a cyclic number.

It is not a de Polignac number, because 384157021 - 2¹⁵ = 384124253 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 (384157001) 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, 15736 + ... + 31873.

It is an arithmetic number, because the mean of its divisors is an integer number (96053175).

Almost surely, 2^384157021 is an apocalyptic number.

It is an amenable number.

384157021 is a deficient number, since it is larger than the sum of its proper divisors (55679).

384157021 is an equidigital number, since it uses as much as digits as its factorization.

384157021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55678.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 384157021 is about 19599.9240049547. The cubic root of 384157021 is about 726.9472951921.

The spelling of 384157021 in words is "three hundred eighty-four million, one hundred fifty-seven thousand, twenty-one".