138656410 has 8 divisors (see below), whose sum is σ = 249581556. Its totient is φ = 55462560.

The previous prime is 138656407. The next prime is 138656417. The reversal of 138656410 is 14656831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 135512881 + 3143529 = 11641^2 + 1773^2 .

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

It is not an unprimeable number, because it can be changed into a prime (138656417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6932811 + ... + 6932830.

Almost surely, 2^138656410 is an apocalyptic number.

138656410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138656410 is a deficient number, since it is larger than the sum of its proper divisors (110925146).

138656410 is a wasteful number, since it uses less digits than its factorization.

138656410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13865648.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 138656410 is about 11775.2456449961. The cubic root of 138656410 is about 517.5829765739.

The spelling of 138656410 in words is "one hundred thirty-eight million, six hundred fifty-six thousand, four hundred ten".