1855297920 has 512 divisors, whose sum is σ = 7188111360. Its totient is φ = 398131200.

The previous prime is 1855297879. The next prime is 1855297933. The reversal of 1855297920 is 297925581.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1855297920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25415004 + ... + 25415076.

It is an arithmetic number, because the mean of its divisors is an integer number (14039280).

Almost surely, 2^1855297920 is an apocalyptic number.

1855297920 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 1855297920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3594055680).

1855297920 is an abundant number, since it is smaller than the sum of its proper divisors (5332813440).

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

1855297920 is a wasteful number, since it uses less digits than its factorization.

1855297920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 48.

The square root of 1855297920 is about 43073.1693749137. The cubic root of 1855297920 is about 1228.7717529585.

The spelling of 1855297920 in words is "one billion, eight hundred fifty-five million, two hundred ninety-seven thousand, nine hundred twenty".