1211520 has 64 divisors (see below), whose sum is σ = 3867840. Its totient is φ = 322560.

The previous prime is 1211503. The next prime is 1211531. The reversal of 1211520 is 251121.

1211520 is nontrivially palindromic in base 14.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1211496 and 1211505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1605 + ... + 2235.

It is an arithmetic number, because the mean of its divisors is an integer number (60435).

2^1211520 is an apocalyptic number.

1211520 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 1211520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1933920).

1211520 is an abundant number, since it is smaller than the sum of its proper divisors (2656320).

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

1211520 is an equidigital number, since it uses as much as digits as its factorization.

1211520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 1211520 is about 1100.6906922474. The cubic root of 1211520 is about 106.6048252647.

Adding to 1211520 its reverse (251121), we get a palindrome (1462641).

The spelling of 1211520 in words is "one million, two hundred eleven thousand, five hundred twenty".