1244378477 has 4 divisors (see below), whose sum is σ = 1245392220. Its totient is φ = 1243364736.

The previous prime is 1244378449. The next prime is 1244378483. The reversal of 1244378477 is 7748734421.

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 683351881 + 561026596 = 26141^2 + 23686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244378477 - 2¹⁶ = 1244312941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244378437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505028 + ... + 507485.

It is an arithmetic number, because the mean of its divisors is an integer number (311348055).

Almost surely, 2^1244378477 is an apocalyptic number.

It is an amenable number.

1244378477 is a deficient number, since it is larger than the sum of its proper divisors (1013743).

1244378477 is a wasteful number, since it uses less digits than its factorization.

1244378477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013742.

The product of its digits is 1053696, while the sum is 47.

The square root of 1244378477 is about 35275.7491344975. The cubic root of 1244378477 is about 1075.6000909845.

The spelling of 1244378477 in words is "one billion, two hundred forty-four million, three hundred seventy-eight thousand, four hundred seventy-seven".