1851863040 has 416 divisors, whose sum is σ = 7006253760. Its totient is φ = 462422016.

The previous prime is 1851863033. The next prime is 1851863081. The reversal of 1851863040 is 403681581.

1851863040 is a `hidden beast` number, since 1 + 8 + 5 + 18 + 630 + 4 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1851862986 and 1851863004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9400222 + ... + 9400418.

Almost surely, 2^1851863040 is an apocalyptic number.

1851863040 is a gapful number since it is divisible by the number (10) 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 1851863040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3503126880).

1851863040 is an abundant number, since it is smaller than the sum of its proper divisors (5154390720).

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

1851863040 is a wasteful number, since it uses less digits than its factorization.

1851863040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 224 counting only the distinct ones).

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

The square root of 1851863040 is about 43033.2782855315. The cubic root of 1851863040 is about 1228.0129725912.

It can be divided in two parts, 185 and 1863040, that added together give a square (1863225 = 1365²).

The spelling of 1851863040 in words is "one billion, eight hundred fifty-one million, eight hundred sixty-three thousand, forty".