138471739 has 8 divisors (see below), whose sum is σ = 161934080. Its totient is φ = 115929576.

The previous prime is 138471737. The next prime is 138471779. The reversal of 138471739 is 937174831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138471739 - 2¹ = 138471737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 138471695 and 138471704.

It is not an unprimeable number, because it can be changed into a prime (138471733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229719 + ... + 230320.

It is an arithmetic number, because the mean of its divisors is an integer number (20241760).

Almost surely, 2^138471739 is an apocalyptic number.

138471739 is a deficient number, since it is larger than the sum of its proper divisors (23462341).

138471739 is an equidigital number, since it uses as much as digits as its factorization.

138471739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460089.

The product of its digits is 127008, while the sum is 43.

The square root of 138471739 is about 11767.4015398473. The cubic root of 138471739 is about 517.3530917060.

The spelling of 138471739 in words is "one hundred thirty-eight million, four hundred seventy-one thousand, seven hundred thirty-nine".