1851146640 has 240 divisors, whose sum is σ = 7133757696. Its totient is φ = 421401600.

The previous prime is 1851146621. The next prime is 1851146663. The reversal of 1851146640 is 466411581.

1851146640 is a `hidden beast` number, since 1 + 8 + 5 + 1 + 1 + 4 + 6 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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 = 1851146595 and 1851146604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1566850 + ... + 1568030.

Almost surely, 2^1851146640 is an apocalyptic number.

1851146640 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 1851146640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3566878848).

1851146640 is an abundant number, since it is smaller than the sum of its proper divisors (5282611056).

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

1851146640 is a wasteful number, since it uses less digits than its factorization.

1851146640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518 (or 1509 counting only the distinct ones).

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

The square root of 1851146640 is about 43024.9536896904. The cubic root of 1851146640 is about 1227.8545983948.

The spelling of 1851146640 in words is "one billion, eight hundred fifty-one million, one hundred forty-six thousand, six hundred forty".