138597787 has 8 divisors (see below), whose sum is σ = 147326256. Its totient is φ = 129933312.

The previous prime is 138597779. The next prime is 138597827. The reversal of 138597787 is 787795831.

It is a happy number.

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

It is not a de Polignac number, because 138597787 - 2³ = 138597779 is a prime.

It is a super-2 number, since 2×138597787² = 38418693122594738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138597707) by changing a digit.

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, 11493 + ... + 20230.

It is an arithmetic number, because the mean of its divisors is an integer number (18415782).

Almost surely, 2^138597787 is an apocalyptic number.

138597787 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

138597787 is a deficient number, since it is larger than the sum of its proper divisors (8728469).

138597787 is a wasteful number, since it uses less digits than its factorization.

138597787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31997.

The product of its digits is 2963520, while the sum is 55.

The square root of 138597787 is about 11772.7561343978. The cubic root of 138597787 is about 517.5100227547.

The spelling of 138597787 in words is "one hundred thirty-eight million, five hundred ninety-seven thousand, seven hundred eighty-seven".