138917753 has 4 divisors (see below), whose sum is σ = 149603748. Its totient is φ = 128231760.

The previous prime is 138917749. The next prime is 138917767. The reversal of 138917753 is 357719831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53392249 + 85525504 = 7307^2 + 9248^2 .

It is a cyclic number.

It is not a de Polignac number, because 138917753 - 2² = 138917749 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138917773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5342978 + ... + 5343003.

It is an arithmetic number, because the mean of its divisors is an integer number (37400937).

Almost surely, 2^138917753 is an apocalyptic number.

138917753 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138917753 is a deficient number, since it is larger than the sum of its proper divisors (10685995).

138917753 is a wasteful number, since it uses less digits than its factorization.

138917753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10685994.

The product of its digits is 158760, while the sum is 44.

The square root of 138917753 is about 11786.3375566798. The cubic root of 138917753 is about 517.9079568424.

The spelling of 138917753 in words is "one hundred thirty-eight million, nine hundred seventeen thousand, seven hundred fifty-three".