1819900640 has 24 divisors (see below), whose sum is σ = 4299515640. Its totient is φ = 727960192.

The previous prime is 1819900631. The next prime is 1819900651. The reversal of 1819900640 is 460099181.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1819900594 and 1819900603.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 5687030 + ... + 5687349.

It is an arithmetic number, because the mean of its divisors is an integer number (179146485).

Almost surely, 2^1819900640 is an apocalyptic number.

1819900640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1819900640 is an abundant number, since it is smaller than the sum of its proper divisors (2479615000).

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

1819900640 is a wasteful number, since it uses less digits than its factorization.

1819900640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11374394 (or 11374386 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1819900640 is about 42660.2934823473. The cubic root of 1819900640 is about 1220.9069311153.

The spelling of 1819900640 in words is "one billion, eight hundred nineteen million, nine hundred thousand, six hundred forty".