381893945 has 4 divisors (see below), whose sum is σ = 458272740. Its totient is φ = 305515152.

The previous prime is 381893923. The next prime is 381893957. The reversal of 381893945 is 549398183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549398183 = 163 ⋅3370541.

It can be written as a sum of positive squares in 2 ways, for example, as 141395881 + 240498064 = 11891^2 + 15508^2 .

It is a cyclic number.

It is not a de Polignac number, because 381893945 - 2⁶ = 381893881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 381893893 and 381893902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38189390 + ... + 38189399.

It is an arithmetic number, because the mean of its divisors is an integer number (114568185).

Almost surely, 2^381893945 is an apocalyptic number.

It is an amenable number.

381893945 is a deficient number, since it is larger than the sum of its proper divisors (76378795).

381893945 is an equidigital number, since it uses as much as digits as its factorization.

381893945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76378794.

The product of its digits is 933120, while the sum is 50.

The square root of 381893945 is about 19542.1069744283. The cubic root of 381893945 is about 725.5169962848.

The spelling of 381893945 in words is "three hundred eighty-one million, eight hundred ninety-three thousand, nine hundred forty-five".