1861196447 has 4 divisors (see below), whose sum is σ = 2030396136. Its totient is φ = 1691996760.

The previous prime is 1861196419. The next prime is 1861196483. The reversal of 1861196447 is 7446911681.

It is a happy number.

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-1861196447 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 (1861196947) 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, 84599828 + ... + 84599849.

It is an arithmetic number, because the mean of its divisors is an integer number (507599034).

Almost surely, 2^1861196447 is an apocalyptic number.

1861196447 is a deficient number, since it is larger than the sum of its proper divisors (169199689).

1861196447 is a wasteful number, since it uses less digits than its factorization.

1861196447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169199688.

The product of its digits is 290304, while the sum is 47.

The square root of 1861196447 is about 43141.5860510482. The cubic root of 1861196447 is about 1230.0725819200.

The spelling of 1861196447 in words is "one billion, eight hundred sixty-one million, one hundred ninety-six thousand, four hundred forty-seven".