386390881 has 2 divisors, whose sum is σ = 386390882. Its totient is φ = 386390880.

The previous prime is 386390863. The next prime is 386390891. The reversal of 386390881 is 188093683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309232225 + 77158656 = 17585^2 + 8784^2 .

It is a cyclic number.

It is not a de Polignac number, because 386390881 - 2²⁷ = 252173153 is a prime.

It is a super-2 number, since 2×386390881² = 298595825839912322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (386390891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193195440 + 193195441.

It is an arithmetic number, because the mean of its divisors is an integer number (193195441).

Almost surely, 2^386390881 is an apocalyptic number.

It is an amenable number.

386390881 is a deficient number, since it is larger than the sum of its proper divisors (1).

386390881 is an equidigital number, since it uses as much as digits as its factorization.

386390881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 386390881 is about 19656.8278468323. The cubic root of 386390881 is about 728.3536306985.

The spelling of 386390881 in words is "three hundred eighty-six million, three hundred ninety thousand, eight hundred eighty-one".