1226400401 has 4 divisors (see below), whose sum is σ = 1268690100. Its totient is φ = 1184110704.

The previous prime is 1226400397. The next prime is 1226400437. The reversal of 1226400401 is 1040046221.

It is a Cunningham number, because it is equal to 35020²+1.

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 643129600 + 583270801 = 25360^2 + 24151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226400401 - 2² = 1226400397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226400481) 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, 21144806 + ... + 21144863.

It is an arithmetic number, because the mean of its divisors is an integer number (317172525).

Almost surely, 2^1226400401 is an apocalyptic number.

It is an amenable number.

1226400401 is a deficient number, since it is larger than the sum of its proper divisors (42289699).

1226400401 is an equidigital number, since it uses as much as digits as its factorization.

1226400401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42289698.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1226400401 is about 35020.0000142776. Note that the first 4 decimals coincide. The cubic root of 1226400401 is about 1070.3950563238.

Adding to 1226400401 its reverse (1040046221), we get a palindrome (2266446622).

The spelling of 1226400401 in words is "one billion, two hundred twenty-six million, four hundred thousand, four hundred one".