138191434 has 8 divisors (see below), whose sum is σ = 207494820. Its totient is φ = 69026496.

The previous prime is 138191369. The next prime is 138191477. The reversal of 138191434 is 434191831.

It can be written as a sum of positive squares in 2 ways, for example, as 118875409 + 19316025 = 10903^2 + 4395^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 138191434.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32079 + ... + 36130.

Almost surely, 2^138191434 is an apocalyptic number.

138191434 is a deficient number, since it is larger than the sum of its proper divisors (69303386).

138191434 is a wasteful number, since it uses less digits than its factorization.

138191434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69224.

The product of its digits is 10368, while the sum is 34.

The square root of 138191434 is about 11755.4852728418. The cubic root of 138191434 is about 517.0037674302.

The spelling of 138191434 in words is "one hundred thirty-eight million, one hundred ninety-one thousand, four hundred thirty-four".