383890 has 16 divisors (see below), whose sum is σ = 744408. Its totient is φ = 141696.

The previous prime is 383869. The next prime is 383891. The reversal of 383890 is 98383.

It can be written as a sum of positive squares in 4 ways, for example, as 299209 + 84681 = 547^2 + 291^2 .

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (383891) by changing a digit.

383890 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 1347 + ... + 1606.

2³⁸³⁸⁹⁰ is an apocalyptic number.

383890 is a deficient number, since it is larger than the sum of its proper divisors (360518).

383890 is a wasteful number, since it uses less digits than its factorization.

383890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 383890 is about 619.5885731677. The cubic root of 383890 is about 72.6778826593.

The spelling of 383890 in words is "three hundred eighty-three thousand, eight hundred ninety".