387442381 has 2 divisors, whose sum is σ = 387442382. Its totient is φ = 387442380.

The previous prime is 387442369. The next prime is 387442387. The reversal of 387442381 is 183244783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 322382025 + 65060356 = 17955^2 + 8066^2 .

It is an emirp because it is prime and its reverse (183244783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 387442381 - 2¹³ = 387434189 is a prime.

It is a super-2 number, since 2×387442381² = 300223197189898322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387442387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193721190 + 193721191.

It is an arithmetic number, because the mean of its divisors is an integer number (193721191).

Almost surely, 2^387442381 is an apocalyptic number.

It is an amenable number.

387442381 is a deficient number, since it is larger than the sum of its proper divisors (1).

387442381 is an equidigital number, since it uses as much as digits as its factorization.

387442381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 40.

The square root of 387442381 is about 19683.5561065576. The cubic root of 387442381 is about 729.0137309615.

The spelling of 387442381 in words is "three hundred eighty-seven million, four hundred forty-two thousand, three hundred eighty-one".