1211380 has 24 divisors (see below), whose sum is σ = 2614248. Its totient is φ = 471168.

The previous prime is 1211339. The next prime is 1211381. The reversal of 1211380 is 831121.

It can be written as a sum of positive squares in 4 ways, for example, as 70756 + 1140624 = 266^2 + 1068^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211381) 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 7 ways as a sum of consecutive naturals, for example, 79 + ... + 1558.

It is an arithmetic number, because the mean of its divisors is an integer number (108927).

2^1211380 is an apocalyptic number.

1211380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211380 is an abundant number, since it is smaller than the sum of its proper divisors (1402868).

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

1211380 is a wasteful number, since it uses less digits than its factorization.

1211380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683 (or 1681 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1211380 is about 1100.6270939787. The cubic root of 1211380 is about 106.6007187840.

The spelling of 1211380 in words is "one million, two hundred eleven thousand, three hundred eighty".