1213817 has 8 divisors (see below), whose sum is σ = 1402272. Its totient is φ = 1038400.

The previous prime is 1213801. The next prime is 1213829. The reversal of 1213817 is 7183121.

It is a happy number.

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

It is not a de Polignac number, because 1213817 - 2⁴ = 1213801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213792 and 1213801.

It is not an unprimeable number, because it can be changed into a prime (1213837) 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, 3059 + ... + 3432.

It is an arithmetic number, because the mean of its divisors is an integer number (175284).

2^1213817 is an apocalyptic number.

1213817 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1213817 is a deficient number, since it is larger than the sum of its proper divisors (188455).

1213817 is a wasteful number, since it uses less digits than its factorization.

1213817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6519.

The product of its digits is 336, while the sum is 23.

The square root of 1213817 is about 1101.7336338698. The cubic root of 1213817 is about 106.6721557505.

Adding to 1213817 its reverse (7183121), we get a palindrome (8396938).

The spelling of 1213817 in words is "one million, two hundred thirteen thousand, eight hundred seventeen".