1820720874 has 32 divisors (see below), whose sum is σ = 4250198016. Its totient is φ = 509137200.

The previous prime is 1820720873. The next prime is 1820720879. The reversal of 1820720874 is 4780270281.

It is not an unprimeable number, because it can be changed into a prime (1820720873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459202 + ... + 463149.

It is an arithmetic number, because the mean of its divisors is an integer number (132818688).

Almost surely, 2^1820720874 is an apocalyptic number.

1820720874 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1820720874 is an abundant number, since it is smaller than the sum of its proper divisors (2429477142).

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

1820720874 is a wasteful number, since it uses less digits than its factorization.

1820720874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922410.

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 1820720874 is about 42669.9059525563. The cubic root of 1820720874 is about 1221.0903255531.

The spelling of 1820720874 in words is "one billion, eight hundred twenty million, seven hundred twenty thousand, eight hundred seventy-four".