138872773 has 8 divisors (see below), whose sum is σ = 152377848. Its totient is φ = 125770944.

The previous prime is 138872771. The next prime is 138872837. The reversal of 138872773 is 377278831.

It can be written as a sum of positive squares in 4 ways, for example, as 31169889 + 107702884 = 5583^2 + 10378^2 .

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

It is not a de Polignac number, because 138872773 - 2¹ = 138872771 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 (138872771) 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, 100090 + ... + 101467.

It is an arithmetic number, because the mean of its divisors is an integer number (19047231).

Almost surely, 2^138872773 is an apocalyptic number.

138872773 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138872773 is a deficient number, since it is larger than the sum of its proper divisors (13505075).

138872773 is a wasteful number, since it uses less digits than its factorization.

138872773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201623.

The product of its digits is 395136, while the sum is 46.

The square root of 138872773 is about 11784.4292606812. The cubic root of 138872773 is about 517.8520532253.

The spelling of 138872773 in words is "one hundred thirty-eight million, eight hundred seventy-two thousand, seven hundred seventy-three".