1820145474 has 72 divisors (see below), whose sum is σ = 4608225648. Its totient is φ = 517693680.

The previous prime is 1820145433. The next prime is 1820145487. The reversal of 1820145474 is 4745410281.

It is a happy number.

1820145474 is a `hidden beast` number, since 182 + 0 + 1 + 4 + 5 + 474 = 666.

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 35 ways as a sum of consecutive naturals, for example, 195669 + ... + 204759.

It is an arithmetic number, because the mean of its divisors is an integer number (64003134).

Almost surely, 2^1820145474 is an apocalyptic number.

1820145474 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820145474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2304112824).

1820145474 is an abundant number, since it is smaller than the sum of its proper divisors (2788080174).

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

1820145474 is a wasteful number, since it uses less digits than its factorization.

1820145474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9340 (or 9330 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 1820145474 is about 42663.1629629122. The cubic root of 1820145474 is about 1220.9616788155.

The spelling of 1820145474 in words is "one billion, eight hundred twenty million, one hundred forty-five thousand, four hundred seventy-four".