388421649 has 48 divisors (see below), whose sum is σ = 725437440. Its totient is φ = 201767760.

The previous prime is 388421647. The next prime is 388421687. The reversal of 388421649 is 946124883.

It is a happy number.

It is not a de Polignac number, because 388421649 - 2¹ = 388421647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (388421641) 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 in 47 ways as a sum of consecutive naturals, for example, 8332 + ... + 29090.

It is an arithmetic number, because the mean of its divisors is an integer number (15113280).

Almost surely, 2^388421649 is an apocalyptic number.

It is an amenable number.

388421649 is a deficient number, since it is larger than the sum of its proper divisors (337015791).

388421649 is a wasteful number, since it uses less digits than its factorization.

388421649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20792 (or 20780 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 388421649 is about 19708.4156897504. The cubic root of 388421649 is about 729.6274129189.

The spelling of 388421649 in words is "three hundred eighty-eight million, four hundred twenty-one thousand, six hundred forty-nine".