381139 has 4 divisors (see below), whose sum is σ = 415800. Its totient is φ = 346480.

The previous prime is 381103. The next prime is 381167. The reversal of 381139 is 931183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931183 = 11 ⋅84653.

It is a cyclic number.

It is not a de Polignac number, because 381139 - 2⁷ = 381011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381169) 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, 17314 + ... + 17335.

It is an arithmetic number, because the mean of its divisors is an integer number (103950).

2³⁸¹¹³⁹ is an apocalyptic number.

381139 is a deficient number, since it is larger than the sum of its proper divisors (34661).

381139 is a wasteful number, since it uses less digits than its factorization.

381139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34660.

The product of its digits is 648, while the sum is 25.

The square root of 381139 is about 617.3645600454. The cubic root of 381139 is about 72.5038602780.

The spelling of 381139 in words is "three hundred eighty-one thousand, one hundred thirty-nine".