1212813 has 48 divisors (see below), whose sum is σ = 2236416. Its totient is φ = 641520.

The previous prime is 1212811. The next prime is 1212817. The reversal of 1212813 is 3182121.

It is not a de Polignac number, because 1212813 - 2¹ = 1212811 is a prime.

It is a Curzon number.

1212813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39108 + ... + 39138.

It is an arithmetic number, because the mean of its divisors is an integer number (46592).

2^1212813 is an apocalyptic number.

It is an amenable number.

1212813 is a deficient number, since it is larger than the sum of its proper divisors (1023603).

1212813 is an equidigital number, since it uses as much as digits as its factorization.

1212813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 64 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1212813 is about 1101.2778940849. The cubic root of 1212813 is about 106.6427366023.

Adding to 1212813 its reverse (3182121), we get a palindrome (4394934).

It can be divided in two parts, 1212 and 813, that added together give a square (2025 = 45²).

The spelling of 1212813 in words is "one million, two hundred twelve thousand, eight hundred thirteen".