381869 has 4 divisors (see below), whose sum is σ = 398496. Its totient is φ = 365244.

The previous prime is 381859. The next prime is 381911. The reversal of 381869 is 968183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 968183 = 19 ⋅50957.

It is a cyclic number.

It is not a de Polignac number, because 381869 - 2⁴ = 381853 is a prime.

It is a super-2 number, since 2×381869² = 291647866322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381859) 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, 8279 + ... + 8324.

It is an arithmetic number, because the mean of its divisors is an integer number (99624).

2³⁸¹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

381869 is a deficient number, since it is larger than the sum of its proper divisors (16627).

381869 is a wasteful number, since it uses less digits than its factorization.

381869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16626.

The product of its digits is 10368, while the sum is 35.

The square root of 381869 is about 617.9555000160. The cubic root of 381869 is about 72.5501199215.

The spelling of 381869 in words is "three hundred eighty-one thousand, eight hundred sixty-nine".