383399861 has 8 divisors (see below), whose sum is σ = 437180184. Its totient is φ = 333089280.

The previous prime is 383399837. The next prime is 383399873. The reversal of 383399861 is 168993383.

It can be written as a sum of positive squares in 4 ways, for example, as 107640625 + 275759236 = 10375^2 + 16606^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 383399861 - 2¹⁴ = 383383477 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 (383399881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 867200 + ... + 867641.

It is an arithmetic number, because the mean of its divisors is an integer number (54647523).

Almost surely, 2^383399861 is an apocalyptic number.

It is an amenable number.

383399861 is a deficient number, since it is larger than the sum of its proper divisors (53780323).

383399861 is a wasteful number, since it uses less digits than its factorization.

383399861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734871.

The product of its digits is 839808, while the sum is 50.

The square root of 383399861 is about 19580.5990970654. The cubic root of 383399861 is about 726.4693852084.

The spelling of 383399861 in words is "three hundred eighty-three million, three hundred ninety-nine thousand, eight hundred sixty-one".