138637210 has 32 divisors (see below), whose sum is σ = 266172480. Its totient is φ = 51808512.

The previous prime is 138637207. The next prime is 138637211. The reversal of 138637210 is 12736831.

138637210 is digitally balanced in base 2, because in such base 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 (138637211) 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, 20697 + ... + 26563.

It is an arithmetic number, because the mean of its divisors is an integer number (8317890).

Almost surely, 2^138637210 is an apocalyptic number.

138637210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138637210 is a deficient number, since it is larger than the sum of its proper divisors (127535270).

138637210 is a wasteful number, since it uses less digits than its factorization.

138637210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6030.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 138637210 is about 11774.4303471548. The cubic root of 138637210 is about 517.5590852590.

The spelling of 138637210 in words is "one hundred thirty-eight million, six hundred thirty-seven thousand, two hundred ten".