386764921 has 2 divisors, whose sum is σ = 386764922. Its totient is φ = 386764920.

The previous prime is 386764913. The next prime is 386764951. The reversal of 386764921 is 129467683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232135696 + 154629225 = 15236^2 + 12435^2 .

It is an emirp because it is prime and its reverse (129467683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 386764921 - 2³ = 386764913 is a prime.

It is a super-2 number, since 2×386764921² = 299174208232272482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (386764951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193382460 + 193382461.

It is an arithmetic number, because the mean of its divisors is an integer number (193382461).

Almost surely, 2^386764921 is an apocalyptic number.

It is an amenable number.

386764921 is a deficient number, since it is larger than the sum of its proper divisors (1).

386764921 is an equidigital number, since it uses as much as digits as its factorization.

386764921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The square root of 386764921 is about 19666.3397967187. The cubic root of 386764921 is about 728.5885789028.

The spelling of 386764921 in words is "three hundred eighty-six million, seven hundred sixty-four thousand, nine hundred twenty-one".