1438788909 has 16 divisors (see below), whose sum is σ = 1936725120. Its totient is φ = 950066880.

The previous prime is 1438788899. The next prime is 1438788947. The reversal of 1438788909 is 9098878341.

It is not a de Polignac number, because 1438788909 - 2⁵ = 1438788877 is a prime.

It is a super-2 number, since 2×1438788909² = 4140227049322820562, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438788209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130024 + ... + 140654.

It is an arithmetic number, because the mean of its divisors is an integer number (121045320).

Almost surely, 2^1438788909 is an apocalyptic number.

It is an amenable number.

1438788909 is a deficient number, since it is larger than the sum of its proper divisors (497936211).

1438788909 is a wasteful number, since it uses less digits than its factorization.

1438788909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11060.

The product of its (nonzero) digits is 3483648, while the sum is 57.

The square root of 1438788909 is about 37931.3710403407. The cubic root of 1438788909 is about 1128.9265680132.

The spelling of 1438788909 in words is "one billion, four hundred thirty-eight million, seven hundred eighty-eight thousand, nine hundred nine".