138621410 has 32 divisors (see below), whose sum is σ = 257040000. Its totient is φ = 53792640.

The previous prime is 138621403. The next prime is 138621419. The reversal of 138621410 is 14126831.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138621410.

It is not an unprimeable number, because it can be changed into a prime (138621419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80741 + ... + 82439.

It is an arithmetic number, because the mean of its divisors is an integer number (8032500).

Almost surely, 2^138621410 is an apocalyptic number.

138621410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138621410 is a deficient number, since it is larger than the sum of its proper divisors (118418590).

138621410 is a wasteful number, since it uses less digits than its factorization.

138621410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 138621410 is about 11773.7593826271. The cubic root of 138621410 is about 517.5394230432.

The spelling of 138621410 in words is "one hundred thirty-eight million, six hundred twenty-one thousand, four hundred ten".