388645541 has 2 divisors, whose sum is σ = 388645542. Its totient is φ = 388645540.

The previous prime is 388645531. The next prime is 388645547. The reversal of 388645541 is 145546883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197514916 + 191130625 = 14054^2 + 13825^2 .

It is an emirp because it is prime and its reverse (145546883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 388645541 - 2¹⁰ = 388644517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 388645492 and 388645501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388645547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194322770 + 194322771.

It is an arithmetic number, because the mean of its divisors is an integer number (194322771).

Almost surely, 2^388645541 is an apocalyptic number.

It is an amenable number.

388645541 is a deficient number, since it is larger than the sum of its proper divisors (1).

388645541 is an equidigital number, since it uses as much as digits as its factorization.

388645541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 460800, while the sum is 44.

The square root of 388645541 is about 19714.0949830318. The cubic root of 388645541 is about 729.7675753463.

The spelling of 388645541 in words is "three hundred eighty-eight million, six hundred forty-five thousand, five hundred forty-one".