138510840 has 64 divisors (see below), whose sum is σ = 447501600. Its totient is φ = 34094592.

The previous prime is 138510829. The next prime is 138510871. The reversal of 138510840 is 48015831.

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

It is a junction number, because it is equal to n+sod(n) for n = 138510798 and 138510807.

It is a congruent number.

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, 42835 + ... + 45954.

Almost surely, 2^138510840 is an apocalyptic number.

138510840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138510840 is an abundant number, since it is smaller than the sum of its proper divisors (308990760).

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

138510840 is a wasteful number, since it uses less digits than its factorization.

138510840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88816 (or 88812 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 138510840 is about 11769.0628343976. The cubic root of 138510840 is about 517.4017830361.

The spelling of 138510840 in words is "one hundred thirty-eight million, five hundred ten thousand, eight hundred forty".