11531380 has 48 divisors (see below), whose sum is σ = 28578816. Its totient is φ = 3824640.

The previous prime is 11531371. The next prime is 11531407. The reversal of 11531380 is 8313511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3012 + ... + 5668.

It is an arithmetic number, because the mean of its divisors is an integer number (595392).

Almost surely, 2^11531380 is an apocalyptic number.

11531380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11531380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14289408).

11531380 is an abundant number, since it is smaller than the sum of its proper divisors (17047436).

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

11531380 is a wasteful number, since it uses less digits than its factorization.

11531380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704 (or 2702 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 11531380 is about 3395.7885682121. The cubic root of 11531380 is about 225.9229904430.

Adding to 11531380 its reverse (8313511), we get a palindrome (19844891).

It can be divided in two parts, 11531 and 380, that added together give a palindrome (11911).

The spelling of 11531380 in words is "eleven million, five hundred thirty-one thousand, three hundred eighty".