11191890 has 16 divisors (see below), whose sum is σ = 26860608. Its totient is φ = 2984496.

The previous prime is 11191867. The next prime is 11191897. The reversal of 11191890 is 9819111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 373063 = 11191890 / (1 + 1 + 1 + 9 + 1 + 8 + 9 + 0).

It is not an unprimeable number, because it can be changed into a prime (11191897) by changing a digit.

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, 186502 + ... + 186561.

It is an arithmetic number, because the mean of its divisors is an integer number (1678788).

Almost surely, 2^11191890 is an apocalyptic number.

11191890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11191890 is an abundant number, since it is smaller than the sum of its proper divisors (15668718).

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

11191890 is a wasteful number, since it uses less digits than its factorization.

11191890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373073.

The product of its (nonzero) digits is 648, while the sum is 30.

The square root of 11191890 is about 3345.4282237107. The cubic root of 11191890 is about 223.6837719994.

The spelling of 11191890 in words is "eleven million, one hundred ninety-one thousand, eight hundred ninety".