381728973 has 4 divisors (see below), whose sum is σ = 508971968. Its totient is φ = 254485980.

The previous prime is 381728959. The next prime is 381728987. The reversal of 381728973 is 379827183.

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.

It is an interprime number because it is at equal distance from previous prime (381728959) and next prime (381728987).

It is not a de Polignac number, because 381728973 - 2⁴ = 381728957 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 (381728933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63621493 + ... + 63621498.

It is an arithmetic number, because the mean of its divisors is an integer number (127242992).

Almost surely, 2^381728973 is an apocalyptic number.

It is an amenable number.

381728973 is a deficient number, since it is larger than the sum of its proper divisors (127242995).

381728973 is a wasteful number, since it uses less digits than its factorization.

381728973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127242994.

The product of its digits is 508032, while the sum is 48.

The square root of 381728973 is about 19537.8855816079. The cubic root of 381728973 is about 725.4125107068.

The spelling of 381728973 in words is "three hundred eighty-one million, seven hundred twenty-eight thousand, nine hundred seventy-three".