138513510 has 32 divisors (see below), whose sum is σ = 369370080. Its totient is φ = 36936864.

The previous prime is 138513503. The next prime is 138513511. The reversal of 138513510 is 15315831.

138513510 is a `hidden beast` number, since 138 + 5 + 13 + 510 = 666.

138513510 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138513511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256237 + ... + 256776.

It is an arithmetic number, because the mean of its divisors is an integer number (11542815).

Almost surely, 2^138513510 is an apocalyptic number.

138513510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138513510 is an abundant number, since it is smaller than the sum of its proper divisors (230856570).

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

138513510 is a wasteful number, since it uses less digits than its factorization.

138513510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513029 (or 513023 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 138513510 is about 11769.1762668421. The cubic root of 138513510 is about 517.4051075747.

The spelling of 138513510 in words is "one hundred thirty-eight million, five hundred thirteen thousand, five hundred ten".