105212639 has 8 divisors (see below), whose sum is σ = 120358560. Its totient is φ = 90095616.

The previous prime is 105212629. The next prime is 105212641. The reversal of 105212639 is 936212501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 105212639 - 2⁴ = 105212623 is a prime.

It is a super-2 number, since 2×105212639² = 22139398810688642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105212629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1247 + ... + 14559.

It is an arithmetic number, because the mean of its divisors is an integer number (15044820).

Almost surely, 2^105212639 is an apocalyptic number.

105212639 is a deficient number, since it is larger than the sum of its proper divisors (15145921).

105212639 is a wasteful number, since it uses less digits than its factorization.

105212639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14449.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 105212639 is about 10257.3212389980. The cubic root of 105212639 is about 472.0876486062.

The spelling of 105212639 in words is "one hundred five million, two hundred twelve thousand, six hundred thirty-nine".