1861380558 has 24 divisors (see below), whose sum is σ = 4270226688. Its totient is φ = 583962432.

The previous prime is 1861380491. The next prime is 1861380601. The reversal of 1861380558 is 8550831681.

1861380558 is a `hidden beast` number, since 1 + 8 + 6 + 13 + 80 + 558 = 666.

It is a super-3 number, since 3×1861380558³ (a number of 29 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3041166 + ... + 3041777.

It is an arithmetic number, because the mean of its divisors is an integer number (177926112).

Almost surely, 2^1861380558 is an apocalyptic number.

1861380558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1861380558 is an abundant number, since it is smaller than the sum of its proper divisors (2408846130).

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

1861380558 is a wasteful number, since it uses less digits than its factorization.

1861380558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6082968 (or 6082965 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 1861380558 is about 43143.7197979034. The cubic root of 1861380558 is about 1230.1131404948.

The spelling of 1861380558 in words is "one billion, eight hundred sixty-one million, three hundred eighty thousand, five hundred fifty-eight".