1244040401 has 4 divisors (see below), whose sum is σ = 1244125092. Its totient is φ = 1243955712.

The previous prime is 1244040397. The next prime is 1244040407. The reversal of 1244040401 is 1040404421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1040404421 = 7 ⋅148629203.

It can be written as a sum of positive squares in 2 ways, for example, as 1054950400 + 189090001 = 32480^2 + 13751^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244040401 - 2² = 1244040397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1244040407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13976 + ... + 51801.

It is an arithmetic number, because the mean of its divisors is an integer number (311031273).

Almost surely, 2^1244040401 is an apocalyptic number.

It is an amenable number.

1244040401 is a deficient number, since it is larger than the sum of its proper divisors (84691).

1244040401 is an equidigital number, since it uses as much as digits as its factorization.

1244040401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84690.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1244040401 is about 35270.9569050799. The cubic root of 1244040401 is about 1075.5026748797.

Adding to 1244040401 its reverse (1040404421), we get a palindrome (2284444822).

The spelling of 1244040401 in words is "one billion, two hundred forty-four million, forty thousand, four hundred one".