138225090 has 32 divisors (see below), whose sum is σ = 332642880. Its totient is φ = 36759744.

The previous prime is 138225089. The next prime is 138225127. The reversal of 138225090 is 90522831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5292 + ... + 17448.

It is an arithmetic number, because the mean of its divisors is an integer number (10395090).

Almost surely, 2^138225090 is an apocalyptic number.

138225090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138225090 is an abundant number, since it is smaller than the sum of its proper divisors (194417790).

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

138225090 is a wasteful number, since it uses less digits than its factorization.

138225090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12546.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 138225090 is about 11756.9166876354. The cubic root of 138225090 is about 517.0457354594.

The spelling of 138225090 in words is "one hundred thirty-eight million, two hundred twenty-five thousand, ninety".