1213861 has 8 divisors (see below), whose sum is σ = 1334304. Its totient is φ = 1095120.

The previous prime is 1213841. The next prime is 1213873. The reversal of 1213861 is 1683121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213861 - 2⁵ = 1213829 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213801) 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, 1455 + ... + 2131.

It is an arithmetic number, because the mean of its divisors is an integer number (166788).

2^1213861 is an apocalyptic number.

1213861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213861 is a deficient number, since it is larger than the sum of its proper divisors (120443).

1213861 is a wasteful number, since it uses less digits than its factorization.

1213861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

The product of its digits is 288, while the sum is 22.

The square root of 1213861 is about 1101.7536022178. The cubic root of 1213861 is about 106.6734446648.

Adding to 1213861 its reverse (1683121), we get a palindrome (2896982).

The spelling of 1213861 in words is "one million, two hundred thirteen thousand, eight hundred sixty-one".