1384779505 has 4 divisors (see below), whose sum is σ = 1661735412. Its totient is φ = 1107823600.

The previous prime is 1384779481. The next prime is 1384779511. The reversal of 1384779505 is 5059774831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5059774831 = 137 ⋅36932663.

It can be written as a sum of positive squares in 2 ways, for example, as 843379681 + 541399824 = 29041^2 + 23268^2 .

It is not a de Polignac number, because 1384779505 - 2¹³ = 1384771313 is a prime.

It is a super-2 number, since 2×1384779505² = 3835228554936090050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138477946 + ... + 138477955.

It is an arithmetic number, because the mean of its divisors is an integer number (415433853).

Almost surely, 2^1384779505 is an apocalyptic number.

It is an amenable number.

1384779505 is a deficient number, since it is larger than the sum of its proper divisors (276955907).

1384779505 is an equidigital number, since it uses as much as digits as its factorization.

1384779505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276955906.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 1384779505 is about 37212.6256128212. The cubic root of 1384779505 is about 1114.6201136361.

The spelling of 1384779505 in words is "one billion, three hundred eighty-four million, seven hundred seventy-nine thousand, five hundred five".