1820398688 has 24 divisors (see below), whose sum is σ = 3671325000. Its totient is φ = 887998720.

The previous prime is 1820398669. The next prime is 1820398747. The reversal of 1820398688 is 8868930281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 692438 + ... + 695061.

It is an arithmetic number, because the mean of its divisors is an integer number (152971875).

Almost surely, 2^1820398688 is an apocalyptic number.

It is an amenable number.

1820398688 is an abundant number, since it is smaller than the sum of its proper divisors (1850926312).

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

1820398688 is a wasteful number, since it uses less digits than its factorization.

1820398688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387550 (or 1387542 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 53.

The square root of 1820398688 is about 42666.1304549639. The cubic root of 1820398688 is about 1221.0182952159.

The spelling of 1820398688 in words is "one billion, eight hundred twenty million, three hundred ninety-eight thousand, six hundred eighty-eight".