138453591 has 16 divisors (see below), whose sum is σ = 189015680. Its totient is φ = 90119520.

The previous prime is 138453577. The next prime is 138453607. The reversal of 138453591 is 195354831.

It is not a de Polignac number, because 138453591 - 2⁷ = 138453463 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138453541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22716 + ... + 28158.

It is an arithmetic number, because the mean of its divisors is an integer number (11813480).

Almost surely, 2^138453591 is an apocalyptic number.

138453591 is a deficient number, since it is larger than the sum of its proper divisors (50562089).

138453591 is a wasteful number, since it uses less digits than its factorization.

138453591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5646.

The product of its digits is 64800, while the sum is 39.

The square root of 138453591 is about 11766.6304012661. The cubic root of 138453591 is about 517.3304894186.

The spelling of 138453591 in words is "one hundred thirty-eight million, four hundred fifty-three thousand, five hundred ninety-one".