138650453 has 4 divisors (see below), whose sum is σ = 146806380. Its totient is φ = 130494528.

The previous prime is 138650437. The next prime is 138650459. The reversal of 138650453 is 354056831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 354056831 = 9833 ⋅36007.

It can be written as a sum of positive squares in 2 ways, for example, as 102373924 + 36276529 = 10118^2 + 6023^2 .

It is a cyclic number.

It is not a de Polignac number, because 138650453 - 2⁴ = 138650437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138650459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4077938 + ... + 4077971.

It is an arithmetic number, because the mean of its divisors is an integer number (36701595).

Almost surely, 2^138650453 is an apocalyptic number.

It is an amenable number.

138650453 is a deficient number, since it is larger than the sum of its proper divisors (8155927).

138650453 is an equidigital number, since it uses as much as digits as its factorization.

138650453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8155926.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 138650453 is about 11774.9926963884. The cubic root of 138650453 is about 517.5755642806.

The spelling of 138650453 in words is "one hundred thirty-eight million, six hundred fifty thousand, four hundred fifty-three".