1244213401 has 4 divisors (see below), whose sum is σ = 1264610404. Its totient is φ = 1223816400.

The previous prime is 1244213389. The next prime is 1244213407. The reversal of 1244213401 is 1043124421.

It is a happy number.

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 521894025 + 722319376 = 22845^2 + 26876^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244213401 - 2¹⁹ = 1243689113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1244213407) 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, 10198410 + ... + 10198531.

It is an arithmetic number, because the mean of its divisors is an integer number (316152601).

Almost surely, 2^1244213401 is an apocalyptic number.

It is an amenable number.

1244213401 is a deficient number, since it is larger than the sum of its proper divisors (20397003).

1244213401 is an equidigital number, since it uses as much as digits as its factorization.

1244213401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20397002.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1244213401 is about 35273.4092625025. The cubic root of 1244213401 is about 1075.5525267812.

Adding to 1244213401 its reverse (1043124421), we get a palindrome (2287337822).

The spelling of 1244213401 in words is "one billion, two hundred forty-four million, two hundred thirteen thousand, four hundred one".