138221403 has 8 divisors (see below), whose sum is σ = 187772688. Its totient is φ = 90408864.

The previous prime is 138221401. The next prime is 138221431. The reversal of 138221403 is 304122831.

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

It is not a de Polignac number, because 138221403 - 2¹ = 138221401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138221401) 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, 434500 + ... + 434817.

It is an arithmetic number, because the mean of its divisors is an integer number (23471586).

Almost surely, 2^138221403 is an apocalyptic number.

138221403 is a deficient number, since it is larger than the sum of its proper divisors (49551285).

138221403 is an equidigital number, since it uses as much as digits as its factorization.

138221403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869373.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 138221403 is about 11756.7598852745. The cubic root of 138221403 is about 517.0411382126.

Subtracting from 138221403 its product of nonzero digits (1152), we obtain a triangular number (138220251 = T₁₆₆₂₆).

It can be divided in two parts, 13822 and 1403, that added together give a triangular number (15225 = T₁₇₄).

The spelling of 138221403 in words is "one hundred thirty-eight million, two hundred twenty-one thousand, four hundred three".