138946247 has 16 divisors (see below), whose sum is σ = 157138944. Its totient is φ = 121716000.

The previous prime is 138946237. The next prime is 138946261. The reversal of 138946247 is 742649831.

It is a cyclic number.

It is not a de Polignac number, because 138946247 - 2¹⁴ = 138929863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138946198 and 138946207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138946237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93722 + ... + 95192.

It is an arithmetic number, because the mean of its divisors is an integer number (9821184).

Almost surely, 2^138946247 is an apocalyptic number.

138946247 is a deficient number, since it is larger than the sum of its proper divisors (18192697).

138946247 is a wasteful number, since it uses less digits than its factorization.

138946247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790.

The product of its digits is 290304, while the sum is 44.

The square root of 138946247 is about 11787.5462671414. The cubic root of 138946247 is about 517.9433645091.

The spelling of 138946247 in words is "one hundred thirty-eight million, nine hundred forty-six thousand, two hundred forty-seven".