138206377 has 4 divisors (see below), whose sum is σ = 138304656. Its totient is φ = 138108100.

The previous prime is 138206363. The next prime is 138206381. The reversal of 138206377 is 773602831.

138206377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138206377 - 2⁷ = 138206249 is a prime.

It is a super-2 number, since 2×138206377² = 38202005286932258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138206347) 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, 46999 + ... + 49852.

It is an arithmetic number, because the mean of its divisors is an integer number (34576164).

Almost surely, 2^138206377 is an apocalyptic number.

It is an amenable number.

138206377 is a deficient number, since it is larger than the sum of its proper divisors (98279).

138206377 is an equidigital number, since it uses as much as digits as its factorization.

138206377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98278.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 138206377 is about 11756.1208312946. The cubic root of 138206377 is about 517.0224017470.

The spelling of 138206377 in words is "one hundred thirty-eight million, two hundred six thousand, three hundred seventy-seven".