11397720 has 64 divisors (see below), whose sum is σ = 36000000. Its totient is φ = 2878848.

The previous prime is 11397707. The next prime is 11397721. The reversal of 11397720 is 2779311.

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 (11397721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220 + ... + 4779.

It is an arithmetic number, because the mean of its divisors is an integer number (562500).

Almost surely, 2^11397720 is an apocalyptic number.

11397720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11397720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18000000).

11397720 is an abundant number, since it is smaller than the sum of its proper divisors (24602280).

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

11397720 is a wasteful number, since it uses less digits than its factorization.

11397720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5032 (or 5028 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 11397720 is about 3376.0509474829. The cubic root of 11397720 is about 225.0467063532.

The spelling of 11397720 in words is "eleven million, three hundred ninety-seven thousand, seven hundred twenty".