11857940 has 12 divisors (see below), whose sum is σ = 24901716. Its totient is φ = 4743168.

The previous prime is 11857931. The next prime is 11857969. The reversal of 11857940 is 4975811.

It can be written as a sum of positive squares in 2 ways, for example, as 1643524 + 10214416 = 1282^2 + 3196^2 .

It is a super-2 number, since 2×11857940² = 281221482087200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11857940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296429 + ... + 296468.

It is an arithmetic number, because the mean of its divisors is an integer number (2075143).

Almost surely, 2^11857940 is an apocalyptic number.

11857940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11857940 is an abundant number, since it is smaller than the sum of its proper divisors (13043776).

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

11857940 is a wasteful number, since it uses less digits than its factorization.

11857940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592906 (or 592904 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 11857940 is about 3443.5359733855. The cubic root of 11857940 is about 228.0358259082.

It can be divided in two parts, 11 and 857940, that multiplied together give a triangular number (9437340 = T₄₃₄₄).

The spelling of 11857940 in words is "eleven million, eight hundred fifty-seven thousand, nine hundred forty".