108400945 has 4 divisors (see below), whose sum is σ = 130081140. Its totient is φ = 86720752.

The previous prime is 108400939. The next prime is 108400949. The reversal of 108400945 is 549004801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549004801 = 41 ⋅13390361.

It can be written as a sum of positive squares in 2 ways, for example, as 62473216 + 45927729 = 7904^2 + 6777^2 .

It is a cyclic number.

It is not a de Polignac number, because 108400945 - 2⁵ = 108400913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (108400949) 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, 10840090 + ... + 10840099.

It is an arithmetic number, because the mean of its divisors is an integer number (32520285).

Almost surely, 2^108400945 is an apocalyptic number.

It is an amenable number.

108400945 is a deficient number, since it is larger than the sum of its proper divisors (21680195).

108400945 is an equidigital number, since it uses as much as digits as its factorization.

108400945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21680194.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 108400945 is about 10411.5774501273. The cubic root of 108400945 is about 476.8089031137.

The spelling of 108400945 in words is "one hundred eight million, four hundred thousand, nine hundred forty-five".