388903969 has 2 divisors, whose sum is σ = 388903970. Its totient is φ = 388903968.

The previous prime is 388903967. The next prime is 388903981. The reversal of 388903969 is 969309883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275161744 + 113742225 = 16588^2 + 10665^2 .

It is a cyclic number.

It is not a de Polignac number, because 388903969 - 2¹ = 388903967 is a prime.

It is a super-2 number, since 2×388903969² = 302492594207905922, which contains 22 as substring.

Together with 388903967, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (388903961) 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, 194451984 + 194451985.

It is an arithmetic number, because the mean of its divisors is an integer number (194451985).

Almost surely, 2^388903969 is an apocalyptic number.

It is an amenable number.

388903969 is a deficient number, since it is larger than the sum of its proper divisors (1).

388903969 is an equidigital number, since it uses as much as digits as its factorization.

388903969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 388903969 is about 19720.6482905608. The cubic root of 388903969 is about 729.9292913311.

The spelling of 388903969 in words is "three hundred eighty-eight million, nine hundred three thousand, nine hundred sixty-nine".