1438686819 has 16 divisors (see below), whose sum is σ = 2180956800. Its totient is φ = 936818568.

The previous prime is 1438686811. The next prime is 1438686841. The reversal of 1438686819 is 9186868341.

It is not a de Polignac number, because 1438686819 - 2³ = 1438686811 is a prime.

It is a super-2 number, since 2×1438686819² = 4139639526328677522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1438686811) 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, 618429 + ... + 620750.

It is an arithmetic number, because the mean of its divisors is an integer number (136309800).

Almost surely, 2^1438686819 is an apocalyptic number.

1438686819 is a deficient number, since it is larger than the sum of its proper divisors (742269981).

1438686819 is a wasteful number, since it uses less digits than its factorization.

1438686819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239231 (or 1239225 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 1438686819 is about 37930.0252965906. The cubic root of 1438686819 is about 1128.8998661951.

The spelling of 1438686819 in words is "one billion, four hundred thirty-eight million, six hundred eighty-six thousand, eight hundred nineteen".