381398409 has 24 divisors (see below), whose sum is σ = 657287520. Its totient is φ = 217941192.

The previous prime is 381398377. The next prime is 381398431. The reversal of 381398409 is 904893183.

It is not a de Polignac number, because 381398409 - 2⁵ = 381398377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381398449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142819 + ... + 145464.

It is an arithmetic number, because the mean of its divisors is an integer number (27386980).

Almost surely, 2^381398409 is an apocalyptic number.

It is an amenable number.

381398409 is a deficient number, since it is larger than the sum of its proper divisors (275889111).

381398409 is a wasteful number, since it uses less digits than its factorization.

381398409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288306 (or 288293 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 381398409 is about 19529.4241850598. The cubic root of 381398409 is about 725.2030562425.

The spelling of 381398409 in words is "three hundred eighty-one million, three hundred ninety-eight thousand, four hundred nine".