138262247 has 4 divisors (see below), whose sum is σ = 139317816. Its totient is φ = 137206680.

The previous prime is 138262237. The next prime is 138262253. The reversal of 138262247 is 742262831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 742262831 = 23 ⋅32272297.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138262247 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 (138262237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527588 + ... + 527849.

It is an arithmetic number, because the mean of its divisors is an integer number (34829454).

Almost surely, 2^138262247 is an apocalyptic number.

138262247 is a deficient number, since it is larger than the sum of its proper divisors (1055569).

138262247 is a wasteful number, since it uses less digits than its factorization.

138262247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055568.

The product of its digits is 32256, while the sum is 35.

The square root of 138262247 is about 11758.4968001867. The cubic root of 138262247 is about 517.0920612197.

The spelling of 138262247 in words is "one hundred thirty-eight million, two hundred sixty-two thousand, two hundred forty-seven".