138970 has 16 divisors (see below), whose sum is σ = 269640. Its totient is φ = 51264.

The previous prime is 138967. The next prime is 138977. The reversal of 138970 is 79831.

It can be written as a sum of positive squares in 4 ways, for example, as 84681 + 54289 = 291^2 + 233^2 .

It is not an unprimeable number, because it can be changed into a prime (138977) 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, 405 + ... + 664.

2¹³⁸⁹⁷⁰ is an apocalyptic number.

138970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138970 is a deficient number, since it is larger than the sum of its proper divisors (130670).

138970 is a wasteful number, since it uses less digits than its factorization.

138970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 138970 is about 372.7868023415. The cubic root of 138970 is about 51.7972877140.

The spelling of 138970 in words is "one hundred thirty-eight thousand, nine hundred seventy".