138670 has 24 divisors (see below), whose sum is σ = 291384. Its totient is φ = 47376.

The previous prime is 138661. The next prime is 138679. The reversal of 138670 is 76831.

It is an interprime number because it is at equal distance from previous prime (138661) and next prime (138679).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 349 + ... + 631.

It is an arithmetic number, because the mean of its divisors is an integer number (12141).

2¹³⁸⁶⁷⁰ is an apocalyptic number.

138670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138670 is an abundant number, since it is smaller than the sum of its proper divisors (152714).

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

138670 is a wasteful number, since it uses less digits than its factorization.

138670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 138670 is about 372.3842101916. The cubic root of 138670 is about 51.7599885812.

It can be divided in two parts, 1386 and 70, that multiplied together give a triangular number (97020 = T₄₄₀).

The spelling of 138670 in words is "one hundred thirty-eight thousand, six hundred seventy".