11991450 has 24 divisors (see below), whose sum is σ = 29739168. Its totient is φ = 3197680.

The previous prime is 11991449. The next prime is 11991457. The reversal of 11991450 is 5419911.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11991457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39822 + ... + 40121.

It is an arithmetic number, because the mean of its divisors is an integer number (1239132).

Almost surely, 2^11991450 is an apocalyptic number.

11991450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11991450 is an abundant number, since it is smaller than the sum of its proper divisors (17747718).

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

11991450 is a wasteful number, since it uses less digits than its factorization.

11991450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79958 (or 79953 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 30.

The square root of 11991450 is about 3462.8673090374. The cubic root of 11991450 is about 228.8884616652. Note that the first 3 decimals are identical.

The spelling of 11991450 in words is "eleven million, nine hundred ninety-one thousand, four hundred fifty".