70138 has 4 divisors (see below), whose sum is σ = 105210. Its totient is φ = 35068.

The previous prime is 70123. The next prime is 70139. The reversal of 70138 is 83107.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83107 = 41 ⋅2027.

It can be written as a sum of positive squares in only one way, i.e., 38809 + 31329 = 197^2 + 177^2 .

It is not an unprimeable number, because it can be changed into a prime (70139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17533 + ... + 17536.

2⁷⁰¹³⁸ is an apocalyptic number.

70138 is a deficient number, since it is larger than the sum of its proper divisors (35072).

70138 is a wasteful number, since it uses less digits than its factorization.

70138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35071.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 70138 is about 264.8357981845. The cubic root of 70138 is about 41.2399179523.

It can be divided in two parts, 7013 and 8, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 70138 in words is "seventy thousand, one hundred thirty-eight".