5661939 has 8 divisors (see below), whose sum is σ = 7724992. Its totient is φ = 3686760.

The previous prime is 5661923. The next prime is 5661941. The reversal of 5661939 is 9391665.

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

It is not a de Polignac number, because 5661939 - 2⁴ = 5661923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5661897 and 5661906.

It is not an unprimeable number, because it can be changed into a prime (5661739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21817 + ... + 22074.

It is an arithmetic number, because the mean of its divisors is an integer number (965624).

Almost surely, 2^5661939 is an apocalyptic number.

5661939 is a deficient number, since it is larger than the sum of its proper divisors (2063053).

5661939 is a wasteful number, since it uses less digits than its factorization.

5661939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43937.

The product of its digits is 43740, while the sum is 39.

The square root of 5661939 is about 2379.4829270243. The cubic root of 5661939 is about 178.2331141753.

The spelling of 5661939 in words is "five million, six hundred sixty-one thousand, nine hundred thirty-nine".