2403661 has 8 divisors (see below), whose sum is σ = 2701440. Its totient is φ = 2122032.

The previous prime is 2403659. The next prime is 2403673. The reversal of 2403661 is 1663042.

2403661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2403661 - 2¹ = 2403659 is a prime.

It is a Duffinian number.

2403661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2403691) 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 7 ways as a sum of consecutive naturals, for example, 3721 + ... + 4318.

It is an arithmetic number, because the mean of its divisors is an integer number (337680).

2^2403661 is an apocalyptic number.

It is an amenable number.

2403661 is a deficient number, since it is larger than the sum of its proper divisors (297779).

2403661 is a wasteful number, since it uses less digits than its factorization.

2403661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8075.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 2403661 is about 1550.3744708940. The cubic root of 2403661 is about 133.9546330421.

The spelling of 2403661 in words is "two million, four hundred three thousand, six hundred sixty-one".