138315460 has 24 divisors (see below), whose sum is σ = 293342616. Its totient is φ = 54777600.

The previous prime is 138315439. The next prime is 138315469. The reversal of 138315460 is 64513831.

It can be written as a sum of positive squares in 4 ways, for example, as 19766916 + 118548544 = 4446^2 + 10888^2 .

It is not an unprimeable number, because it can be changed into a prime (138315469) 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, 32217 + ... + 36256.

It is an arithmetic number, because the mean of its divisors is an integer number (12222609).

Almost surely, 2^138315460 is an apocalyptic number.

138315460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138315460 is an abundant number, since it is smaller than the sum of its proper divisors (155027156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138315460 is a wasteful number, since it uses less digits than its factorization.

138315460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68583 (or 68581 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 138315460 is about 11760.7593292270. The cubic root of 138315460 is about 517.1583904628.

It can be divided in two parts, 13831 and 5460, that added together give a palindrome (19291).

The spelling of 138315460 in words is "one hundred thirty-eight million, three hundred fifteen thousand, four hundred sixty".