138491227 has 16 divisors (see below), whose sum is σ = 160876800. Its totient is φ = 116769312.

The previous prime is 138491191. The next prime is 138491237. The reversal of 138491227 is 722194831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138491227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138491237) 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, 202428 + ... + 203110.

It is an arithmetic number, because the mean of its divisors is an integer number (10054800).

Almost surely, 2^138491227 is an apocalyptic number.

138491227 is a deficient number, since it is larger than the sum of its proper divisors (22385573).

138491227 is an equidigital number, since it uses as much as digits as its factorization.

138491227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122.

The product of its digits is 24192, while the sum is 37.

The square root of 138491227 is about 11768.2295609832. The cubic root of 138491227 is about 517.3773606872.

The spelling of 138491227 in words is "one hundred thirty-eight million, four hundred ninety-one thousand, two hundred twenty-seven".