10219865 has 8 divisors (see below), whose sum is σ = 12563208. Its totient is φ = 7976320.

The previous prime is 10219841. The next prime is 10219877. The reversal of 10219865 is 56891201.

It can be written as a sum of positive squares in 4 ways, for example, as 215296 + 10004569 = 464^2 + 3163^2 .

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

It is not a de Polignac number, because 10219865 - 2⁸ = 10219609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24722 + ... + 25131.

It is an arithmetic number, because the mean of its divisors is an integer number (1570401).

Almost surely, 2^10219865 is an apocalyptic number.

It is an amenable number.

10219865 is a deficient number, since it is larger than the sum of its proper divisors (2343343).

10219865 is an equidigital number, since it uses as much as digits as its factorization.

10219865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49899.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 10219865 is about 3196.8523581798. The cubic root of 10219865 is about 217.0109857322.

The spelling of 10219865 in words is "ten million, two hundred nineteen thousand, eight hundred sixty-five".