105439399 has 4 divisors (see below), whose sum is σ = 113550136. Its totient is φ = 97328664.

The previous prime is 105439387. The next prime is 105439487. The reversal of 105439399 is 993934501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 105439399 - 2²¹ = 103342247 is a prime.

It is a super-2 number, since 2×105439399² = 22234933722962402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105439309) 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, 4055349 + ... + 4055374.

It is an arithmetic number, because the mean of its divisors is an integer number (28387534).

Almost surely, 2^105439399 is an apocalyptic number.

105439399 is a deficient number, since it is larger than the sum of its proper divisors (8110737).

105439399 is an equidigital number, since it uses as much as digits as its factorization.

105439399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8110736.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 105439399 is about 10268.3688578079. The cubic root of 105439399 is about 472.4265615640.

The spelling of 105439399 in words is "one hundred five million, four hundred thirty-nine thousand, three hundred ninety-nine".