11903661 has 48 divisors (see below), whose sum is σ = 21790080. Its totient is φ = 6082560.

The previous prime is 11903657. The next prime is 11903669. The reversal of 11903661 is 16630911.

11903661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11903661 - 2² = 11903657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11903669) 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 47 ways as a sum of consecutive naturals, for example, 61581 + ... + 61773.

It is an arithmetic number, because the mean of its divisors is an integer number (453960).

Almost surely, 2^11903661 is an apocalyptic number.

11903661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11903661 is a deficient number, since it is larger than the sum of its proper divisors (9886419).

11903661 is a wasteful number, since it uses less digits than its factorization.

11903661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 11903661 is about 3450.1682567666. The cubic root of 11903661 is about 228.3285314611.

It can be divided in two parts, 1190 and 3661, that added together give a triangular number (4851 = T₉₈).

The spelling of 11903661 in words is "eleven million, nine hundred three thousand, six hundred sixty-one".