1211860 has 48 divisors (see below), whose sum is σ = 2822400. Its totient is φ = 434304.

The previous prime is 1211857. The next prime is 1211863. The reversal of 1211860 is 681121.

It is an interprime number because it is at equal distance from previous prime (1211857) and next prime (1211863).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15301 + ... + 15379.

It is an arithmetic number, because the mean of its divisors is an integer number (58800).

2^1211860 is an apocalyptic number.

1211860 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 1211860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1411200).

1211860 is an abundant number, since it is smaller than the sum of its proper divisors (1610540).

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

1211860 is a wasteful number, since it uses less digits than its factorization.

1211860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1211860 is about 1100.8451298889. The cubic root of 1211860 is about 106.6147968294.

Adding to 1211860 its reverse (681121), we get a palindrome (1892981).

The spelling of 1211860 in words is "one million, two hundred eleven thousand, eight hundred sixty".