381397 has 4 divisors (see below), whose sum is σ = 382636. Its totient is φ = 380160.
The previous prime is 381389. The next prime is 381401. The reversal of 381397 is 793183.
381397 is nontrivially palindromic in base 14 and base 16.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 793183 = 61 ⋅13003.
It can be written as a sum of positive squares in 2 ways, for example, as 352836 + 28561 = 594^2 + 169^2 .
It is a cyclic number.
It is not a de Polignac number, because 381397 - 23 = 381389 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (381347) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247 + ... + 907.
It is an arithmetic number, because the mean of its divisors is an integer number (95659).
2381397 is an apocalyptic number.
It is an amenable number.
381397 is a deficient number, since it is larger than the sum of its proper divisors (1239).
381397 is an equidigital number, since it uses as much as digits as its factorization.
381397 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1238.
The product of its digits is 4536, while the sum is 31.
The square root of 381397 is about 617.5734774098. The cubic root of 381397 is about 72.5202163202.
The spelling of 381397 in words is "three hundred eighty-one thousand, three hundred ninety-seven".
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