381947136 has 72 divisors (see below), whose sum is σ = 1021787424. Its totient is φ = 126658560.

The previous prime is 381947123. The next prime is 381947147. The reversal of 381947136 is 631749183.

It is a super-2 number, since 2×381947136² = 291767229397204992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160870 + ... + 163226.

It is an arithmetic number, because the mean of its divisors is an integer number (14191492).

Almost surely, 2^381947136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381947136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (510893712).

381947136 is an abundant number, since it is smaller than the sum of its proper divisors (639840288).

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

381947136 is a wasteful number, since it uses less digits than its factorization.

381947136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587 (or 2573 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 381947136 is about 19543.4678601317. The cubic root of 381947136 is about 725.5506785706.

The spelling of 381947136 in words is "three hundred eighty-one million, nine hundred forty-seven thousand, one hundred thirty-six".