861219407 has 4 divisors (see below), whose sum is σ = 874073496. Its totient is φ = 848365320.

The previous prime is 861219379. The next prime is 861219427. The reversal of 861219407 is 704912168.

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 861219407 - 2⁶ = 861219343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861219427) 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, 6426944 + ... + 6427077.

It is an arithmetic number, because the mean of its divisors is an integer number (218518374).

Almost surely, 2^861219407 is an apocalyptic number.

861219407 is a deficient number, since it is larger than the sum of its proper divisors (12854089).

861219407 is a wasteful number, since it uses less digits than its factorization.

861219407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12854088.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 861219407 is about 29346.5399493705. The cubic root of 861219407 is about 951.4177932622.

The spelling of 861219407 in words is "eight hundred sixty-one million, two hundred nineteen thousand, four hundred seven".