138434670 has 96 divisors (see below), whose sum is σ = 407272320. Its totient is φ = 33553440.

The previous prime is 138434669. The next prime is 138434671. The reversal of 138434670 is 76434831.

It is an interprime number because it is at equal distance from previous prime (138434669) and next prime (138434671).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138434671) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24141 + ... + 29319.

It is an arithmetic number, because the mean of its divisors is an integer number (4242420).

Almost surely, 2^138434670 is an apocalyptic number.

138434670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138434670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203636160).

138434670 is an abundant number, since it is smaller than the sum of its proper divisors (268837650).

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

138434670 is a wasteful number, since it uses less digits than its factorization.

138434670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5212 (or 5200 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 138434670 is about 11765.8263628187. The cubic root of 138434670 is about 517.3069223012.

The spelling of 138434670 in words is "one hundred thirty-eight million, four hundred thirty-four thousand, six hundred seventy".