388649746 has 8 divisors (see below), whose sum is σ = 588323340. Its totient is φ = 192541968.

The previous prime is 388649711. The next prime is 388649749. The reversal of 388649746 is 647946883.

It can be written as a sum of positive squares in 2 ways, for example, as 325622025 + 63027721 = 18045^2 + 7939^2 .

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

It is not an unprimeable number, because it can be changed into a prime (388649749) 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 3 ways as a sum of consecutive naturals, for example, 891181 + ... + 891616.

Almost surely, 2^388649746 is an apocalyptic number.

388649746 is a deficient number, since it is larger than the sum of its proper divisors (199673594).

388649746 is a wasteful number, since it uses less digits than its factorization.

388649746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782908.

The product of its digits is 6967296, while the sum is 55.

The square root of 388649746 is about 19714.2016323259. The cubic root of 388649746 is about 729.7702072746.

The spelling of 388649746 in words is "three hundred eighty-eight million, six hundred forty-nine thousand, seven hundred forty-six".