381390745 has 8 divisors (see below), whose sum is σ = 473450760. Its totient is φ = 294591360.

The previous prime is 381390701. The next prime is 381390773. The reversal of 381390745 is 547093183.

It can be written as a sum of positive squares in 4 ways, for example, as 47961 + 381342784 = 219^2 + 19528^2 .

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

It is not a de Polignac number, because 381390745 - 2¹⁷ = 381259673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 381390698 and 381390707.

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, 1314996 + ... + 1315285.

It is an arithmetic number, because the mean of its divisors is an integer number (59181345).

Almost surely, 2^381390745 is an apocalyptic number.

It is an amenable number.

381390745 is a deficient number, since it is larger than the sum of its proper divisors (92060015).

381390745 is a wasteful number, since it uses less digits than its factorization.

381390745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630315.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 381390745 is about 19529.2279673314. The cubic root of 381390745 is about 725.1981986856.

The spelling of 381390745 in words is "three hundred eighty-one million, three hundred ninety thousand, seven hundred forty-five".