138684234 has 16 divisors (see below), whose sum is σ = 298704672. Its totient is φ = 42672048.

The previous prime is 138684233. The next prime is 138684241. The reversal of 138684234 is 432486831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 138684192 and 138684201.

It is not an unprimeable number, because it can be changed into a prime (138684233) 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, 888924 + ... + 889079.

It is an arithmetic number, because the mean of its divisors is an integer number (18669042).

Almost surely, 2^138684234 is an apocalyptic number.

138684234 is an abundant number, since it is smaller than the sum of its proper divisors (160020438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138684234 is a wasteful number, since it uses less digits than its factorization.

138684234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778021.

The product of its digits is 110592, while the sum is 39.

The square root of 138684234 is about 11776.4270472839. The cubic root of 138684234 is about 517.6175951575.

The spelling of 138684234 in words is "one hundred thirty-eight million, six hundred eighty-four thousand, two hundred thirty-four".