11155990 has 8 divisors (see below), whose sum is σ = 20080800. Its totient is φ = 4462392.

The previous prime is 11155973. The next prime is 11155993. The reversal of 11155990 is 9955111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×11155990² = 248912225760200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155993) 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 3 ways as a sum of consecutive naturals, for example, 557790 + ... + 557809.

It is an arithmetic number, because the mean of its divisors is an integer number (2510100).

Almost surely, 2^11155990 is an apocalyptic number.

11155990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11155990 is a deficient number, since it is larger than the sum of its proper divisors (8924810).

11155990 is a wasteful number, since it uses less digits than its factorization.

11155990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115606.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 11155990 is about 3340.0583827233. The cubic root of 11155990 is about 223.4443471747. Note that the first 3 decimals are identical.

The spelling of 11155990 in words is "eleven million, one hundred fifty-five thousand, nine hundred ninety".