381428885 has 8 divisors (see below), whose sum is σ = 457837440. Its totient is φ = 305061264.

The previous prime is 381428837. The next prime is 381428891. The reversal of 381428885 is 588824183.

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 381428885 - 2¹² = 381424789 is a prime.

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, 16736 + ... + 32294.

It is an arithmetic number, because the mean of its divisors is an integer number (57229680).

Almost surely, 2^381428885 is an apocalyptic number.

It is an amenable number.

381428885 is a deficient number, since it is larger than the sum of its proper divisors (76408555).

381428885 is a wasteful number, since it uses less digits than its factorization.

381428885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20467.

The product of its digits is 491520, while the sum is 47.

The square root of 381428885 is about 19530.2044280135. The cubic root of 381428885 is about 725.2223717397. Note that the first 3 decimals are identical.

The spelling of 381428885 in words is "three hundred eighty-one million, four hundred twenty-eight thousand, eight hundred eighty-five".