138066225 has 48 divisors (see below), whose sum is σ = 251394624. Its totient is φ = 66304000.

The previous prime is 138066221. The next prime is 138066251. The reversal of 138066225 is 522660831.

It is not a de Polignac number, because 138066225 - 2² = 138066221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (138066221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92485 + ... + 93965.

It is an arithmetic number, because the mean of its divisors is an integer number (5237388).

Almost surely, 2^138066225 is an apocalyptic number.

138066225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138066225 is a deficient number, since it is larger than the sum of its proper divisors (113328399).

138066225 is a wasteful number, since it uses less digits than its factorization.

138066225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618 (or 1613 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 138066225 is about 11750.1585095691. The cubic root of 138066225 is about 516.8475756814.

The spelling of 138066225 in words is "one hundred thirty-eight million, sixty-six thousand, two hundred twenty-five".