381285819 has 16 divisors (see below), whose sum is σ = 565831840. Its totient is φ = 253756800.

The previous prime is 381285799. The next prime is 381285841. The reversal of 381285819 is 918582183.

It is a happy number.

It is not a de Polignac number, because 381285819 - 2¹² = 381281723 is a prime.

It is a super-2 number, since 2×381285819² = 290757751541001522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381285119) 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, 4479 + ... + 27975.

It is an arithmetic number, because the mean of its divisors is an integer number (35364490).

Almost surely, 2^381285819 is an apocalyptic number.

381285819 is a deficient number, since it is larger than the sum of its proper divisors (184546021).

381285819 is a wasteful number, since it uses less digits than its factorization.

381285819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24107 (or 24101 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 381285819 is about 19526.5413988243. The cubic root of 381285819 is about 725.1316884846.

The spelling of 381285819 in words is "three hundred eighty-one million, two hundred eighty-five thousand, eight hundred nineteen".