138121233 has 32 divisors (see below), whose sum is σ = 197821440. Its totient is φ = 85525440.

The previous prime is 138121223. The next prime is 138121261. The reversal of 138121233 is 332121831.

It is not a de Polignac number, because 138121233 - 2⁵ = 138121201 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138121223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 654498 + ... + 654708.

It is an arithmetic number, because the mean of its divisors is an integer number (6181920).

Almost surely, 2^138121233 is an apocalyptic number.

It is an amenable number.

138121233 is a deficient number, since it is larger than the sum of its proper divisors (59700207).

138121233 is a wasteful number, since it uses less digits than its factorization.

138121233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469.

The product of its digits is 864, while the sum is 24.

The square root of 138121233 is about 11752.4990108487. The cubic root of 138121233 is about 516.9162069403.

The spelling of 138121233 in words is "one hundred thirty-eight million, one hundred twenty-one thousand, two hundred thirty-three".