381011616 has 144 divisors (see below), whose sum is σ = 1167566400. Its totient is φ = 117417984.

The previous prime is 381011597. The next prime is 381011621. The reversal of 381011616 is 616110183.

381011616 is a `hidden beast` number, since 38 + 1 + 0 + 11 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 381011616.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288205 + ... + 289523.

It is an arithmetic number, because the mean of its divisors is an integer number (8108100).

Almost surely, 2^381011616 is an apocalyptic number.

381011616 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381011616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (583783200).

381011616 is an abundant number, since it is smaller than the sum of its proper divisors (786554784).

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

381011616 is a wasteful number, since it uses less digits than its factorization.

381011616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411 (or 1400 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 381011616 is about 19519.5188465290. The cubic root of 381011616 is about 724.9578198211.

Adding to 381011616 its reverse (616110183), we get a palindrome (997121799).

The spelling of 381011616 in words is "three hundred eighty-one million, eleven thousand, six hundred sixteen".