1861319952 has 80 divisors (see below), whose sum is σ = 5623896000. Its totient is φ = 587782656.

The previous prime is 1861319951. The next prime is 1861319959. The reversal of 1861319952 is 2599131681.

1861319952 is a `hidden beast` number, since 18 + 613 + 19 + 9 + 5 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1861319898 and 1861319907.

It is not an unprimeable number, because it can be changed into a prime (1861319951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105177 + ... + 121592.

It is an arithmetic number, because the mean of its divisors is an integer number (70298700).

Almost surely, 2^1861319952 is an apocalyptic number.

1861319952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1861319952 is an abundant number, since it is smaller than the sum of its proper divisors (3762576048).

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

1861319952 is a wasteful number, since it uses less digits than its factorization.

1861319952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226805 (or 226793 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 1861319952 is about 43143.0174188130. The cubic root of 1861319952 is about 1230.0997896433.

The spelling of 1861319952 in words is "one billion, eight hundred sixty-one million, three hundred nineteen thousand, nine hundred fifty-two".