11909860 has 48 divisors (see below), whose sum is σ = 27651456. Its totient is φ = 4285952.

The previous prime is 11909851. The next prime is 11909869. The reversal of 11909860 is 6890911.

11909860 = T₂₄ + T₂₅ + ... + T₄₁₄.

It is an interprime number because it is at equal distance from previous prime (11909851) and next prime (11909869).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11909869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7059 + ... + 8581.

It is an arithmetic number, because the mean of its divisors is an integer number (576072).

Almost surely, 2^11909860 is an apocalyptic number.

11909860 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 11909860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13825728).

11909860 is an abundant number, since it is smaller than the sum of its proper divisors (15741596).

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

11909860 is a wasteful number, since it uses less digits than its factorization.

11909860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572 (or 1570 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 11909860 is about 3451.0665018223. The cubic root of 11909860 is about 228.3681596881.

It can be divided in two parts, 11909 and 860, that added together give a square (12769 = 113²).

The spelling of 11909860 in words is "eleven million, nine hundred nine thousand, eight hundred sixty".