1438779953 has 8 divisors (see below), whose sum is σ = 1549816296. Its totient is φ = 1327795200.

The previous prime is 1438779821. The next prime is 1438780087. The reversal of 1438779953 is 3599778341.

It can be written as a sum of positive squares in 4 ways, for example, as 197767969 + 1241011984 = 14063^2 + 35228^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1438779953 - 2¹⁸ = 1438517809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1438779553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60563 + ... + 80903.

It is an arithmetic number, because the mean of its divisors is an integer number (193727037).

Almost surely, 2^1438779953 is an apocalyptic number.

1438779953 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1438779953 is a deficient number, since it is larger than the sum of its proper divisors (111036343).

1438779953 is a wasteful number, since it uses less digits than its factorization.

1438779953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25795.

The product of its digits is 5715360, while the sum is 56.

The square root of 1438779953 is about 37931.2529848409. The cubic root of 1438779953 is about 1128.9242256063.

The spelling of 1438779953 in words is "one billion, four hundred thirty-eight million, seven hundred seventy-nine thousand, nine hundred fifty-three".