1222400005 has 4 divisors (see below), whose sum is σ = 1466880012. Its totient is φ = 977920000.

The previous prime is 1222399991. The next prime is 1222400009. The reversal of 1222400005 is 5000042221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 422754721 + 799645284 = 20561^2 + 28278^2 .

It is not a de Polignac number, because 1222400005 - 2⁵ = 1222399973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222400009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122239996 + ... + 122240005.

It is an arithmetic number, because the mean of its divisors is an integer number (366720003).

Almost surely, 2^1222400005 is an apocalyptic number.

It is an amenable number.

1222400005 is a deficient number, since it is larger than the sum of its proper divisors (244480007).

1222400005 is an equidigital number, since it uses as much as digits as its factorization.

1222400005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244480006.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 1222400005 is about 34962.8374849639. The cubic root of 1222400005 is about 1069.2299478819.

Adding to 1222400005 its reverse (5000042221), we get a palindrome (6222442226).

The spelling of 1222400005 in words is "one billion, two hundred twenty-two million, four hundred thousand, five".