1226789401 has 4 divisors (see below), whose sum is σ = 1226867472. Its totient is φ = 1226711332.

The previous prime is 1226789351. The next prime is 1226789437. The reversal of 1226789401 is 1049876221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1226789401 - 2⁷ = 1226789273 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226789461) 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, 6331 + ... + 49936.

It is an arithmetic number, because the mean of its divisors is an integer number (306716868).

Almost surely, 2^1226789401 is an apocalyptic number.

It is an amenable number.

1226789401 is a deficient number, since it is larger than the sum of its proper divisors (78071).

1226789401 is an equidigital number, since it uses as much as digits as its factorization.

1226789401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78070.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1226789401 is about 35025.5535430919. The cubic root of 1226789401 is about 1070.5082166642.

The spelling of 1226789401 in words is "one billion, two hundred twenty-six million, seven hundred eighty-nine thousand, four hundred one".