1820718740 has 24 divisors (see below), whose sum is σ = 3848836992. Its totient is φ = 723463200.

The previous prime is 1820718689. The next prime is 1820718749. The reversal of 1820718740 is 478170281.

It is a junction number, because it is equal to n+sod(n) for n = 1820718694 and 1820718703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820718749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298424 + ... + 304463.

It is an arithmetic number, because the mean of its divisors is an integer number (160368208).

Almost surely, 2^1820718740 is an apocalyptic number.

1820718740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820718740 is an abundant number, since it is smaller than the sum of its proper divisors (2028118252).

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

1820718740 is a wasteful number, since it uses less digits than its factorization.

1820718740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603047 (or 603045 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 38.

The square root of 1820718740 is about 42669.8809466349. The cubic root of 1820718740 is about 1221.0898484879.

The spelling of 1820718740 in words is "one billion, eight hundred twenty million, seven hundred eighteen thousand, seven hundred forty".