381449807 has 2 divisors, whose sum is σ = 381449808. Its totient is φ = 381449806.

The previous prime is 381449759. The next prime is 381449821. The reversal of 381449807 is 708944183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381449807 - 2⁶ = 381449743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381449837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190724903 + 190724904.

It is an arithmetic number, because the mean of its divisors is an integer number (190724904).

Almost surely, 2^381449807 is an apocalyptic number.

381449807 is a deficient number, since it is larger than the sum of its proper divisors (1).

381449807 is an equidigital number, since it uses as much as digits as its factorization.

381449807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 381449807 is about 19530.7400525428. The cubic root of 381449807 is about 725.2356313761.

The spelling of 381449807 in words is "three hundred eighty-one million, four hundred forty-nine thousand, eight hundred seven".