1000381644 has 48 divisors (see below), whose sum is σ = 2610800640. Its totient is φ = 331246800.

The previous prime is 1000381633. The next prime is 1000381649. The reversal of 1000381644 is 4461830001.

1000381644 is a `hidden beast` number, since 10 + 0 + 0 + 3 + 8 + 1 + 644 = 666.

1000381644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1000381649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14364 + ... + 46979.

It is an arithmetic number, because the mean of its divisors is an integer number (54391680).

Almost surely, 2^1000381644 is an apocalyptic number.

It is an amenable number.

1000381644 is an abundant number, since it is smaller than the sum of its proper divisors (1610418996).

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

1000381644 is a wasteful number, since it uses less digits than its factorization.

1000381644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61507 (or 61499 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1000381644 is about 31628.8103475297. The cubic root of 1000381644 is about 1000.1271984865.

The spelling of 1000381644 in words is "one billion, three hundred eighty-one thousand, six hundred forty-four".