11321780 has 12 divisors (see below), whose sum is σ = 23775780. Its totient is φ = 4528704.

The previous prime is 11321759. The next prime is 11321801. The reversal of 11321780 is 8712311.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11321759) and next prime (11321801).

It can be written as a sum of positive squares in 2 ways, for example, as 1449616 + 9872164 = 1204^2 + 3142^2 .

It is a congruent number.

It is an unprimeable number.

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, 283025 + ... + 283064.

It is an arithmetic number, because the mean of its divisors is an integer number (1981315).

Almost surely, 2^11321780 is an apocalyptic number.

11321780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11321780 is an abundant number, since it is smaller than the sum of its proper divisors (12454000).

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

11321780 is a wasteful number, since it uses less digits than its factorization.

11321780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566098 (or 566096 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 11321780 is about 3364.7852828970. The cubic root of 11321780 is about 224.5457832595.

The spelling of 11321780 in words is "eleven million, three hundred twenty-one thousand, seven hundred eighty".