138240453 has 16 divisors (see below), whose sum is σ = 198712640. Its totient is φ = 84979584.

The previous prime is 138240391. The next prime is 138240491. The reversal of 138240453 is 354042831.

It is not a de Polignac number, because 138240453 - 2¹⁰ = 138239429 is a prime.

It is a super-2 number, since 2×138240453² = 38220845691290418, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) 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 self number, because there is not a number n which added to its sum of digits gives 138240453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138240653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61650 + ... + 63852.

It is an arithmetic number, because the mean of its divisors is an integer number (12419540).

Almost surely, 2^138240453 is an apocalyptic number.

138240453 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138240453 is a deficient number, since it is larger than the sum of its proper divisors (60472187).

138240453 is a wasteful number, since it uses less digits than its factorization.

138240453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3828.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 138240453 is about 11757.5700295597. The cubic root of 138240453 is about 517.0648903981.

The spelling of 138240453 in words is "one hundred thirty-eight million, two hundred forty thousand, four hundred fifty-three".