388661772 has 24 divisors (see below), whose sum is σ = 912312576. Its totient is φ = 128777488.

The previous prime is 388661761. The next prime is 388661813. The reversal of 388661772 is 277166883.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94968 + ... + 98975.

It is an arithmetic number, because the mean of its divisors is an integer number (38013024).

Almost surely, 2^388661772 is an apocalyptic number.

It is an amenable number.

388661772 is an abundant number, since it is smaller than the sum of its proper divisors (523650804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388661772 is a wasteful number, since it uses less digits than its factorization.

388661772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194117 (or 194115 counting only the distinct ones).

The product of its digits is 677376, while the sum is 48.

The square root of 388661772 is about 19714.5066385137. The cubic root of 388661772 is about 729.7777342969. Note that the first 4 decimals are identical.

The spelling of 388661772 in words is "three hundred eighty-eight million, six hundred sixty-one thousand, seven hundred seventy-two".