108638465 has 16 divisors (see below), whose sum is σ = 140826000. Its totient is φ = 79978752.

The previous prime is 108638461. The next prime is 108638471. The reversal of 108638465 is 564836801.

It can be written as a sum of positive squares in 8 ways, for example, as 16785409 + 91853056 = 4097^2 + 9584^2 .

It is a cyclic number.

It is not a de Polignac number, because 108638465 - 2² = 108638461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (108638461) 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, 20291 + ... + 25079.

It is an arithmetic number, because the mean of its divisors is an integer number (8801625).

Almost surely, 2^108638465 is an apocalyptic number.

It is an amenable number.

108638465 is a deficient number, since it is larger than the sum of its proper divisors (32187535).

108638465 is a wasteful number, since it uses less digits than its factorization.

108638465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5156.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 108638465 is about 10422.9777415094. The cubic root of 108638465 is about 477.1568983427.

The spelling of 108638465 in words is "one hundred eight million, six hundred thirty-eight thousand, four hundred sixty-five".