381428761 has 8 divisors (see below), whose sum is σ = 436065984. Its totient is φ = 326828400.

The previous prime is 381428713. The next prime is 381428767. The reversal of 381428761 is 167824183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 381428761 - 2¹¹ = 381426713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381428767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18546 + ... + 33268.

It is an arithmetic number, because the mean of its divisors is an integer number (54508248).

Almost surely, 2^381428761 is an apocalyptic number.

It is an amenable number.

381428761 is a deficient number, since it is larger than the sum of its proper divisors (54637223).

381428761 is a wasteful number, since it uses less digits than its factorization.

381428761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18431.

The product of its digits is 64512, while the sum is 40.

The square root of 381428761 is about 19530.2012534433. The cubic root of 381428761 is about 725.2222931513. Note that the first 4 decimals are identical.

The spelling of 381428761 in words is "three hundred eighty-one million, four hundred twenty-eight thousand, seven hundred sixty-one".