11889780 has 48 divisors (see below), whose sum is σ = 38048640. Its totient is φ = 2717568.

The previous prime is 11889751. The next prime is 11889791. The reversal of 11889780 is 8798811.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13735 + ... + 14574.

It is an arithmetic number, because the mean of its divisors is an integer number (792680).

Almost surely, 2^11889780 is an apocalyptic number.

11889780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11889780 is an abundant number, since it is smaller than the sum of its proper divisors (26158860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11889780 is a wasteful number, since it uses less digits than its factorization.

11889780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28328 (or 28326 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 11889780 is about 3448.1560289523. The cubic root of 11889780 is about 228.2397447393.

It can be divided in two parts, 118 and 89780, that added together give a palindrome (89898).

The spelling of 11889780 in words is "eleven million, eight hundred eighty-nine thousand, seven hundred eighty".