11197720 has 32 divisors (see below), whose sum is σ = 25312320. Its totient is φ = 4458240.

The previous prime is 11197687. The next prime is 11197723. The reversal of 11197720 is 2779111.

11197720 = 857² + 858² + ... + 871².

11197720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11197723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10324 + ... + 11356.

It is an arithmetic number, because the mean of its divisors is an integer number (791010).

Almost surely, 2^11197720 is an apocalyptic number.

11197720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11197720 is an abundant number, since it is smaller than the sum of its proper divisors (14114600).

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

11197720 is a wasteful number, since it uses less digits than its factorization.

11197720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 11197720 is about 3346.2994486447. The cubic root of 11197720 is about 223.7226051789.

The spelling of 11197720 in words is "eleven million, one hundred ninety-seven thousand, seven hundred twenty".