2661407 has 4 divisors (see below), whose sum is σ = 3041616. Its totient is φ = 2281200.

The previous prime is 2661403. The next prime is 2661409. The reversal of 2661407 is 7041662.

2661407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2661407 - 2² = 2661403 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 (2661403) 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 3 ways as a sum of consecutive naturals, for example, 190094 + ... + 190107.

It is an arithmetic number, because the mean of its divisors is an integer number (760404).

2^2661407 is an apocalyptic number.

2661407 is a deficient number, since it is larger than the sum of its proper divisors (380209).

2661407 is an equidigital number, since it uses as much as digits as its factorization.

2661407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380208.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 2661407 is about 1631.3819295309. The cubic root of 2661407 is about 138.5810236335.

The spelling of 2661407 in words is "two million, six hundred sixty-one thousand, four hundred seven".