138487851 has 12 divisors (see below), whose sum is σ = 200312112. Its totient is φ = 92198736.

The previous prime is 138487849. The next prime is 138487859. The reversal of 138487851 is 158784831.

It is a happy number.

It is not a de Polignac number, because 138487851 - 2¹ = 138487849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138487797 and 138487806.

It is not an unprimeable number, because it can be changed into a prime (138487859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3351 + ... + 16976.

It is an arithmetic number, because the mean of its divisors is an integer number (16692676).

Almost surely, 2^138487851 is an apocalyptic number.

138487851 is a deficient number, since it is larger than the sum of its proper divisors (61824261).

138487851 is a wasteful number, since it uses less digits than its factorization.

138487851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21090 (or 21087 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 138487851 is about 11768.0861230703. The cubic root of 138487851 is about 517.3731566179.

The spelling of 138487851 in words is "one hundred thirty-eight million, four hundred eighty-seven thousand, eight hundred fifty-one".