138403773 has 6 divisors (see below), whose sum is σ = 199916574. Its totient is φ = 92269176.

The previous prime is 138403763. The next prime is 138403807. The reversal of 138403773 is 377304831.

It can be written as a sum of positive squares in only one way, i.e., 92679129 + 45724644 = 9627^2 + 6762^2 .

It is not a de Polignac number, because 138403773 - 2⁹ = 138403261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138403703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7689090 + ... + 7689107.

It is an arithmetic number, because the mean of its divisors is an integer number (33319429).

Almost surely, 2^138403773 is an apocalyptic number.

It is an amenable number.

138403773 is a deficient number, since it is larger than the sum of its proper divisors (61512801).

138403773 is a wasteful number, since it uses less digits than its factorization.

138403773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15378203 (or 15378200 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 138403773 is about 11764.5132921001. The cubic root of 138403773 is about 517.2684338184.

The spelling of 138403773 in words is "one hundred thirty-eight million, four hundred three thousand, seven hundred seventy-three".