861415 has 4 divisors (see below), whose sum is σ = 1033704. Its totient is φ = 689128.

The previous prime is 861391. The next prime is 861433. The reversal of 861415 is 514168.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861415 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 861415.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86137 + ... + 86146.

It is an arithmetic number, because the mean of its divisors is an integer number (258426).

2⁸⁶¹⁴¹⁵ is an apocalyptic number.

861415 is a deficient number, since it is larger than the sum of its proper divisors (172289).

861415 is a wasteful number, since it uses less digits than its factorization.

861415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172288.

The product of its digits is 960, while the sum is 25.

The square root of 861415 is about 928.1244528618. The cubic root of 861415 is about 95.1489813846.

The spelling of 861415 in words is "eight hundred sixty-one thousand, four hundred fifteen".