138711824 has 10 divisors (see below), whose sum is σ = 268754190. Its totient is φ = 69355904.

The previous prime is 138711817. The next prime is 138711829. The reversal of 138711824 is 428117831.

It can be written as a sum of positive squares in only one way, i.e., 124724224 + 13987600 = 11168^2 + 3740^2 .

It is not an unprimeable number, because it can be changed into a prime (138711829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4334729 + ... + 4334760.

It is an arithmetic number, because the mean of its divisors is an integer number (26875419).

Almost surely, 2^138711824 is an apocalyptic number.

It is an amenable number.

138711824 is a deficient number, since it is larger than the sum of its proper divisors (130042366).

138711824 is an equidigital number, since it uses as much as digits as its factorization.

138711824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8669497 (or 8669491 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 138711824 is about 11777.5983969568. The cubic root of 138711824 is about 517.6519180268.

The spelling of 138711824 in words is "one hundred thirty-eight million, seven hundred eleven thousand, eight hundred twenty-four".