105209387 has 4 divisors (see below), whose sum is σ = 105369216. Its totient is φ = 105049560.

The previous prime is 105209353. The next prime is 105209407. The reversal of 105209387 is 783902501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 783902501 = 1259 ⋅622639.

It is a cyclic number.

It is not a de Polignac number, because 105209387 - 2¹⁸ = 104947243 is a prime.

It is a super-2 number, since 2×105209387² = 22138030225831538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105209087) 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, 78923 + ... + 80244.

It is an arithmetic number, because the mean of its divisors is an integer number (26342304).

Almost surely, 2^105209387 is an apocalyptic number.

105209387 is a deficient number, since it is larger than the sum of its proper divisors (159829).

105209387 is an equidigital number, since it uses as much as digits as its factorization.

105209387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159828.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 105209387 is about 10257.1627168530. The cubic root of 105209387 is about 472.0827846631.

The spelling of 105209387 in words is "one hundred five million, two hundred nine thousand, three hundred eighty-seven".