2661903 has 20 divisors (see below), whose sum is σ = 4051080. Its totient is φ = 1741392.

The previous prime is 2661899. The next prime is 2661917. The reversal of 2661903 is 3091662.

It is a happy number.

2661903 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 2661903 - 2² = 2661899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661943) 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 19 ways as a sum of consecutive naturals, for example, 4501 + ... + 5057.

It is an arithmetic number, because the mean of its divisors is an integer number (202554).

2^2661903 is an apocalyptic number.

2661903 is a deficient number, since it is larger than the sum of its proper divisors (1389177).

2661903 is an equidigital number, since it uses as much as digits as its factorization.

2661903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 2661903 is about 1631.5339408054. The cubic root of 2661903 is about 138.5896321024.

2661903 divided by its sum of digits (27) gives a palindrome (98589).

The spelling of 2661903 in words is "two million, six hundred sixty-one thousand, nine hundred three".