138512650 has 24 divisors (see below), whose sum is σ = 265947264. Its totient is φ = 53617200.

The previous prime is 138512597. The next prime is 138512653. The reversal of 138512650 is 56215831.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (138512653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43132 + ... + 46231.

It is an arithmetic number, because the mean of its divisors is an integer number (11081136).

Almost surely, 2^138512650 is an apocalyptic number.

138512650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138512650 is a deficient number, since it is larger than the sum of its proper divisors (127434614).

138512650 is a wasteful number, since it uses less digits than its factorization.

138512650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89406 (or 89401 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 138512650 is about 11769.1397306685. The cubic root of 138512650 is about 517.4040367542.

The spelling of 138512650 in words is "one hundred thirty-eight million, five hundred twelve thousand, six hundred fifty".