11271990 has 32 divisors (see below), whose sum is σ = 27141120. Its totient is φ = 2996064.

The previous prime is 11271989. The next prime is 11271991. The reversal of 11271990 is 9917211.

It is an interprime number because it is at equal distance from previous prime (11271989) and next prime (11271991).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11271991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17901 + ... + 18519.

It is an arithmetic number, because the mean of its divisors is an integer number (848160).

Almost surely, 2^11271990 is an apocalyptic number.

11271990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11271990 is an abundant number, since it is smaller than the sum of its proper divisors (15869130).

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

11271990 is a wasteful number, since it uses less digits than its factorization.

11271990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 11271990 is about 3357.3784415821. The cubic root of 11271990 is about 224.2161365156.

The spelling of 11271990 in words is "eleven million, two hundred seventy-one thousand, nine hundred ninety".