138087550 has 12 divisors (see below), whose sum is σ = 256842936. Its totient is φ = 55235000.

The previous prime is 138087533. The next prime is 138087559. The reversal of 138087550 is 55780831.

138087550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138087559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1380826 + ... + 1380925.

It is an arithmetic number, because the mean of its divisors is an integer number (21403578).

Almost surely, 2^138087550 is an apocalyptic number.

138087550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138087550 is a deficient number, since it is larger than the sum of its proper divisors (118755386).

138087550 is a wasteful number, since it uses less digits than its factorization.

138087550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2761763 (or 2761758 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 138087550 is about 11751.0659090995. The cubic root of 138087550 is about 516.8741841855.

The spelling of 138087550 in words is "one hundred thirty-eight million, eighty-seven thousand, five hundred fifty".