138665370 has 32 divisors (see below), whose sum is σ = 333144000. Its totient is φ = 36938880.

The previous prime is 138665339. The next prime is 138665377. The reversal of 138665370 is 73566831.

138665370 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (138665377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37881 + ... + 41379.

It is an arithmetic number, because the mean of its divisors is an integer number (10410750).

Almost surely, 2^138665370 is an apocalyptic number.

138665370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138665370 is an abundant number, since it is smaller than the sum of its proper divisors (194478630).

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

138665370 is a wasteful number, since it uses less digits than its factorization.

138665370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 138665370 is about 11775.6260980043. The cubic root of 138665370 is about 517.5941250994.

The spelling of 138665370 in words is "one hundred thirty-eight million, six hundred sixty-five thousand, three hundred seventy".