387928381 has 2 divisors, whose sum is σ = 387928382. Its totient is φ = 387928380.

The previous prime is 387928369. The next prime is 387928421. The reversal of 387928381 is 183829783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266179225 + 121749156 = 16315^2 + 11034^2 .

It is a cyclic number.

It is not a de Polignac number, because 387928381 - 2¹³ = 387920189 is a prime.

It is a super-2 number, since 2×387928381² = 300976857570562322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387928361) 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 as a sum of consecutive naturals, namely, 193964190 + 193964191.

It is an arithmetic number, because the mean of its divisors is an integer number (193964191).

Almost surely, 2^387928381 is an apocalyptic number.

It is an amenable number.

387928381 is a deficient number, since it is larger than the sum of its proper divisors (1).

387928381 is an equidigital number, since it uses as much as digits as its factorization.

387928381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 49.

The square root of 387928381 is about 19695.8975677678. The cubic root of 387928381 is about 729.3184236944.

The spelling of 387928381 in words is "three hundred eighty-seven million, nine hundred twenty-eight thousand, three hundred eighty-one".