1861256124 has 192 divisors, whose sum is σ = 5972198400. Its totient is φ = 488146176.

The previous prime is 1861256099. The next prime is 1861256147. The reversal of 1861256124 is 4216521681.

It is a happy number.

1861256124 is a `hidden beast` number, since 1 + 86 + 12 + 561 + 2 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 2250199 + ... + 2251025.

It is an arithmetic number, because the mean of its divisors is an integer number (31105200).

Almost surely, 2^1861256124 is an apocalyptic number.

1861256124 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861256124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2986099200).

1861256124 is an abundant number, since it is smaller than the sum of its proper divisors (4110942276).

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

1861256124 is a wasteful number, since it uses less digits than its factorization.

1861256124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089 (or 1081 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1861256124 is about 43142.2776867425. The cubic root of 1861256124 is about 1230.0857287065.

The spelling of 1861256124 in words is "one billion, eight hundred sixty-one million, two hundred fifty-six thousand, one hundred twenty-four".