387649786 has 16 divisors (see below), whose sum is σ = 602290440. Its totient is φ = 186903360.

The previous prime is 387649771. The next prime is 387649807. The reversal of 387649786 is 687946783.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 387341761 + 308025 = 19681^2 + 555^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a self number, because there is not a number n which added to its sum of digits gives 387649786.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47056 + ... + 54676.

Almost surely, 2^387649786 is an apocalyptic number.

387649786 is a deficient number, since it is larger than the sum of its proper divisors (214640654).

387649786 is a wasteful number, since it uses less digits than its factorization.

387649786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8529.

The product of its digits is 12192768, while the sum is 58.

The square root of 387649786 is about 19688.8238856464. The cubic root of 387649786 is about 729.1437925552.

The spelling of 387649786 in words is "three hundred eighty-seven million, six hundred forty-nine thousand, seven hundred eighty-six".