1244227644 has 72 divisors (see below), whose sum is σ = 3435239808. Its totient is φ = 376578720.

The previous prime is 1244227631. The next prime is 1244227657. The reversal of 1244227644 is 4467224421.

1244227644 is a `hidden beast` number, since 1 + 2 + 4 + 4 + 2 + 2 + 7 + 644 = 666.

It is an interprime number because it is at equal distance from previous prime (1244227631) and next prime (1244227657).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1244227599 and 1244227608.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 468729 + ... + 471375.

It is an arithmetic number, because the mean of its divisors is an integer number (47711664).

Almost surely, 2^1244227644 is an apocalyptic number.

It is an amenable number.

1244227644 is an abundant number, since it is smaller than the sum of its proper divisors (2191012164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1244227644 is a wasteful number, since it uses less digits than its factorization.

1244227644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855 (or 3850 counting only the distinct ones).

The product of its digits is 86016, while the sum is 36.

The square root of 1244227644 is about 35273.6111562171. The cubic root of 1244227644 is about 1075.5566308564.

The spelling of 1244227644 in words is "one billion, two hundred forty-four million, two hundred twenty-seven thousand, six hundred forty-four".