6381906 has 24 divisors (see below), whose sum is σ = 13007472. Its totient is φ = 2087400.

The previous prime is 6381899. The next prime is 6381911. The reversal of 6381906 is 6091836.

6381906 = T₃₈₈ + T₃₈₉ + ... + T₄₅₈.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30141 + ... + 30351.

It is an arithmetic number, because the mean of its divisors is an integer number (541978).

Almost surely, 2^6381906 is an apocalyptic number.

6381906 is an abundant number, since it is smaller than the sum of its proper divisors (6625566).

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

6381906 is a wasteful number, since it uses less digits than its factorization.

6381906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 6381906 is about 2526.2434562013. The cubic root of 6381906 is about 185.4884196363.

It can be divided in two parts, 63 and 81906, that multiplied together give a triangular number (5160078 = T₃₂₁₂).

The spelling of 6381906 in words is "six million, three hundred eighty-one thousand, nine hundred six".