1861465806 has 16 divisors (see below), whose sum is σ = 4136590800. Its totient is φ = 620488584.

The previous prime is 1861465787. The next prime is 1861465807. The reversal of 1861465806 is 6085641681.

1861465806 is a `hidden beast` number, since 1 + 8 + 61 + 4 + 6 + 580 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861465807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17235741 + ... + 17235848.

It is an arithmetic number, because the mean of its divisors is an integer number (258536925).

Almost surely, 2^1861465806 is an apocalyptic number.

1861465806 is an abundant number, since it is smaller than the sum of its proper divisors (2275124994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861465806 is a wasteful number, since it uses less digits than its factorization.

1861465806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34471600 (or 34471594 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1861465806 is about 43144.7077403475. The cubic root of 1861465806 is about 1230.1319192240.

The spelling of 1861465806 in words is "one billion, eight hundred sixty-one million, four hundred sixty-five thousand, eight hundred six".