381009745 has 4 divisors (see below), whose sum is σ = 457211700. Its totient is φ = 304807792.

The previous prime is 381009691. The next prime is 381009767. The reversal of 381009745 is 547900183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547900183 = 277 ⋅1977979.

It can be written as a sum of positive squares in 2 ways, for example, as 151880976 + 229128769 = 12324^2 + 15137^2 .

It is a cyclic number.

It is not a de Polignac number, because 381009745 - 2¹³ = 381001553 is a prime.

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, 38100970 + ... + 38100979.

It is an arithmetic number, because the mean of its divisors is an integer number (114302925).

Almost surely, 2^381009745 is an apocalyptic number.

It is an amenable number.

381009745 is a deficient number, since it is larger than the sum of its proper divisors (76201955).

381009745 is an equidigital number, since it uses as much as digits as its factorization.

381009745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76201954.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 381009745 is about 19519.4709200839. The cubic root of 381009745 is about 724.9566331571.

The spelling of 381009745 in words is "three hundred eighty-one million, nine thousand, seven hundred forty-five".