138533401 has 4 divisors (see below), whose sum is σ = 141755152. Its totient is φ = 135311652.

The previous prime is 138533371. The next prime is 138533407. The reversal of 138533401 is 104335831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138533401 - 2⁷ = 138533273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138533401.

It is not an unprimeable number, because it can be changed into a prime (138533407) 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 3 ways as a sum of consecutive naturals, for example, 1610811 + ... + 1610896.

It is an arithmetic number, because the mean of its divisors is an integer number (35438788).

Almost surely, 2^138533401 is an apocalyptic number.

It is an amenable number.

138533401 is a deficient number, since it is larger than the sum of its proper divisors (3221751).

138533401 is an equidigital number, since it uses as much as digits as its factorization.

138533401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221750.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 138533401 is about 11770.0212829034. The cubic root of 138533401 is about 517.4298734198.

The spelling of 138533401 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, four hundred one".