388920977 has 2 divisors, whose sum is σ = 388920978. Its totient is φ = 388920976.

The previous prime is 388920971. The next prime is 388920989. The reversal of 388920977 is 779029883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388917841 + 3136 = 19721^2 + 56^2 .

It is a cyclic number.

It is not a de Polignac number, because 388920977 - 2¹⁰ = 388919953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (388920971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194460488 + 194460489.

It is an arithmetic number, because the mean of its divisors is an integer number (194460489).

Almost surely, 2^388920977 is an apocalyptic number.

It is an amenable number.

388920977 is a deficient number, since it is larger than the sum of its proper divisors (1).

388920977 is an equidigital number, since it uses as much as digits as its factorization.

388920977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The square root of 388920977 is about 19721.0795089924. The cubic root of 388920977 is about 729.9399318811.

The spelling of 388920977 in words is "three hundred eighty-eight million, nine hundred twenty thousand, nine hundred seventy-seven".