1438649849 has 18 divisors (see below), whose sum is σ = 1812177630. Its totient is φ = 1138265856.

The previous prime is 1438649833. The next prime is 1438649851. The reversal of 1438649849 is 9489468341.

It can be written as a sum of positive squares in 3 ways, for example, as 82937449 + 1355712400 = 9107^2 + 36820^2 .

It is not a de Polignac number, because 1438649849 - 2⁴ = 1438649833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1438649794 and 1438649803.

It is not an unprimeable number, because it can be changed into a prime (1438649819) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 78584 + ... + 95145.

It is an arithmetic number, because the mean of its divisors is an integer number (100676535).

Almost surely, 2^1438649849 is an apocalyptic number.

It is an amenable number.

1438649849 is a deficient number, since it is larger than the sum of its proper divisors (373527781).

1438649849 is a wasteful number, since it uses less digits than its factorization.

1438649849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173769 (or 173749 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 56.

The square root of 1438649849 is about 37929.5379486753. The cubic root of 1438649849 is about 1128.8901963153.

The spelling of 1438649849 in words is "one billion, four hundred thirty-eight million, six hundred forty-nine thousand, eight hundred forty-nine".