380631816 has 24 divisors (see below), whose sum is σ = 1030878030. Its totient is φ = 126877248.

The previous prime is 380631809. The next prime is 380631817. The reversal of 380631816 is 618136083.

380631816 is a `hidden beast` number, since 3 + 8 + 0 + 631 + 8 + 16 = 666.

It can be written as a sum of positive squares in only one way, i.e., 366569316 + 14062500 = 19146^2 + 3750^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (380631817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2643205 + ... + 2643348.

Almost surely, 2^380631816 is an apocalyptic number.

380631816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

380631816 is an abundant number, since it is smaller than the sum of its proper divisors (650246214).

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

380631816 is a wasteful number, since it uses less digits than its factorization.

380631816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286565 (or 5286558 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 380631816 is about 19509.7876974610. The cubic root of 380631816 is about 724.7168555854.

Adding to 380631816 its reverse (618136083), we get a palindrome (998767899).

The spelling of 380631816 in words is "three hundred eighty million, six hundred thirty-one thousand, eight hundred sixteen".