138507726 has 16 divisors (see below), whose sum is σ = 316589184. Its totient is φ = 39573624.

The previous prime is 138507703. The next prime is 138507749. The reversal of 138507726 is 627705831.

It is an interprime number because it is at equal distance from previous prime (138507703) and next prime (138507749).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1648860 + ... + 1648943.

It is an arithmetic number, because the mean of its divisors is an integer number (19786824).

Almost surely, 2^138507726 is an apocalyptic number.

138507726 is an abundant number, since it is smaller than the sum of its proper divisors (178081458).

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

138507726 is a wasteful number, since it uses less digits than its factorization.

138507726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3297815.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 138507726 is about 11768.9305376487. The cubic root of 138507726 is about 517.3979055990.

The spelling of 138507726 in words is "one hundred thirty-eight million, five hundred seven thousand, seven hundred twenty-six".