138551330 has 16 divisors (see below), whose sum is σ = 249532920. Its totient is φ = 55389312.

The previous prime is 138551323. The next prime is 138551339. The reversal of 138551330 is 33155831.

It can be written as a sum of positive squares in 4 ways, for example, as 135792409 + 2758921 = 11653^2 + 1661^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138551293 and 138551302.

It is not an unprimeable number, because it can be changed into a prime (138551339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24752 + ... + 29828.

Almost surely, 2^138551330 is an apocalyptic number.

138551330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138551330 is a deficient number, since it is larger than the sum of its proper divisors (110981590).

138551330 is a wasteful number, since it uses less digits than its factorization.

138551330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7813.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 138551330 is about 11770.7828966471. The cubic root of 138551330 is about 517.4521943906.

The spelling of 138551330 in words is "one hundred thirty-eight million, five hundred fifty-one thousand, three hundred thirty".