138271819 has 16 divisors (see below), whose sum is σ = 159803392. Its totient is φ = 117194688.

The previous prime is 138271817. The next prime is 138271831. The reversal of 138271819 is 918172831.

It is a cyclic number.

It is not a de Polignac number, because 138271819 - 2¹ = 138271817 is a prime.

It is a super-2 number, since 2×138271819² = 38238191859137522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138271817) 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, 441607 + ... + 441919.

It is an arithmetic number, because the mean of its divisors is an integer number (9987712).

Almost surely, 2^138271819 is an apocalyptic number.

138271819 is a deficient number, since it is larger than the sum of its proper divisors (21531573).

138271819 is a wasteful number, since it uses less digits than its factorization.

138271819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826.

The product of its digits is 24192, while the sum is 40.

The square root of 138271819 is about 11758.9038179585. The cubic root of 138271819 is about 517.1039938359.

The spelling of 138271819 in words is "one hundred thirty-eight million, two hundred seventy-one thousand, eight hundred nineteen".