381399 has 4 divisors (see below), whose sum is σ = 508536. Its totient is φ = 254264.

The previous prime is 381389. The next prime is 381401. The reversal of 381399 is 993183.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 381399 - 2⁴ = 381383 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381399.

It is not an unprimeable number, because it can be changed into a prime (381319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63564 + ... + 63569.

It is an arithmetic number, because the mean of its divisors is an integer number (127134).

2³⁸¹³⁹⁹ is an apocalyptic number.

381399 is a deficient number, since it is larger than the sum of its proper divisors (127137).

381399 is a wasteful number, since it uses less digits than its factorization.

381399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127136.

The product of its digits is 5832, while the sum is 33.

The square root of 381399 is about 617.5750966482. The cubic root of 381399 is about 72.5203430824.

It can be divided in two parts, 381 and 399, that added together give a triangular number (780 = T₃₉).

The spelling of 381399 in words is "three hundred eighty-one thousand, three hundred ninety-nine".