1213653 has 8 divisors (see below), whose sum is σ = 1849408. Its totient is φ = 693504.

The previous prime is 1213651. The next prime is 1213657. The reversal of 1213653 is 3563121.

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

It is not a de Polignac number, because 1213653 - 2¹ = 1213651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 57793 = 1213653 / (1 + 2 + 1 + 3 + 6 + 5 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213651) 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, 28876 + ... + 28917.

It is an arithmetic number, because the mean of its divisors is an integer number (231176).

2^1213653 is an apocalyptic number.

It is an amenable number.

1213653 is a deficient number, since it is larger than the sum of its proper divisors (635755).

1213653 is an equidigital number, since it uses as much as digits as its factorization.

1213653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57803.

The product of its digits is 540, while the sum is 21.

The square root of 1213653 is about 1101.6592032022. The cubic root of 1213653 is about 106.6673513411.

Adding to 1213653 its reverse (3563121), we get a palindrome (4776774).

The spelling of 1213653 in words is "one million, two hundred thirteen thousand, six hundred fifty-three".