2661939 has 48 divisors (see below), whose sum is σ = 4792320. Its totient is φ = 1391040.

The previous prime is 2661937. The next prime is 2661943. The reversal of 2661939 is 9391662.

2661939 is a `hidden beast` number, since 2 + 6 + 619 + 39 = 666.

2661939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2661939 - 2¹ = 2661937 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

2661939 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2661931) 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 47 ways as a sum of consecutive naturals, for example, 56614 + ... + 56660.

It is an arithmetic number, because the mean of its divisors is an integer number (99840).

2^2661939 is an apocalyptic number.

2661939 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2661939 is a deficient number, since it is larger than the sum of its proper divisors (2130381).

2661939 is a wasteful number, since it uses less digits than its factorization.

2661939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 117 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 2661939 is about 1631.5449733305. The cubic root of 2661939 is about 138.5902568690.

It can be divided in two parts, 2661 and 939, that added together give a square (3600 = 60²).

The spelling of 2661939 in words is "two million, six hundred sixty-one thousand, nine hundred thirty-nine".