383661 has 12 divisors (see below), whose sum is σ = 566592. Its totient is φ = 250056.

The previous prime is 383659. The next prime is 383681. The reversal of 383661 is 166383.

It is not a de Polignac number, because 383661 - 2¹ = 383659 is a prime.

It is a Curzon number.

383661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (383611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31 + ... + 876.

It is an arithmetic number, because the mean of its divisors is an integer number (47216).

2³⁸³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

383661 is a deficient number, since it is larger than the sum of its proper divisors (182931).

383661 is a wasteful number, since it uses less digits than its factorization.

383661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960 (or 957 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 383661 is about 619.4037455489. The cubic root of 383661 is about 72.6634283924.

The spelling of 383661 in words is "three hundred eighty-three thousand, six hundred sixty-one".