11891240 has 32 divisors (see below), whose sum is σ = 26860680. Its totient is φ = 4737792.

The previous prime is 11891203. The next prime is 11891251. The reversal of 11891240 is 4219811.

It can be written as a sum of positive squares in 4 ways, for example, as 9647236 + 2244004 = 3106^2 + 1498^2 .

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 7 ways as a sum of consecutive naturals, for example, 14522 + ... + 15318.

Almost surely, 2^11891240 is an apocalyptic number.

11891240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11891240 is an abundant number, since it is smaller than the sum of its proper divisors (14969440).

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

11891240 is a wasteful number, since it uses less digits than its factorization.

11891240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181 (or 1177 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 11891240 is about 3448.3677298107. The cubic root of 11891240 is about 228.2490865547.

The spelling of 11891240 in words is "eleven million, eight hundred ninety-one thousand, two hundred forty".