388400905 has 8 divisors (see below), whose sum is σ = 470437632. Its totient is φ = 307816368.

The previous prime is 388400867. The next prime is 388400923. The reversal of 388400905 is 509004883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 388400905 - 2¹⁵ = 388368137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 362457 + ... + 363526.

It is an arithmetic number, because the mean of its divisors is an integer number (58804704).

Almost surely, 2^388400905 is an apocalyptic number.

It is an amenable number.

388400905 is a deficient number, since it is larger than the sum of its proper divisors (82036727).

388400905 is a wasteful number, since it uses less digits than its factorization.

388400905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726095.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 388400905 is about 19707.8894100814. The cubic root of 388400905 is about 729.6144238896.

The spelling of 388400905 in words is "three hundred eighty-eight million, four hundred thousand, nine hundred five".