138625751 has 8 divisors (see below), whose sum is σ = 153792000. Its totient is φ = 123886840.

The previous prime is 138625741. The next prime is 138625757. The reversal of 138625751 is 157526831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-138625751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138625757) 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, 106151 + ... + 107448.

It is an arithmetic number, because the mean of its divisors is an integer number (19224000).

Almost surely, 2^138625751 is an apocalyptic number.

138625751 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138625751 is a deficient number, since it is larger than the sum of its proper divisors (15166249).

138625751 is a wasteful number, since it uses less digits than its factorization.

138625751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213669.

The product of its digits is 50400, while the sum is 38.

The square root of 138625751 is about 11773.9437318173. The cubic root of 138625751 is about 517.5448253236.

The spelling of 138625751 in words is "one hundred thirty-eight million, six hundred twenty-five thousand, seven hundred fifty-one".