1808149420 has 96 divisors (see below), whose sum is σ = 4897428480. Its totient is φ = 544131840.

The previous prime is 1808149417. The next prime is 1808149433. The reversal of 1808149420 is 249418081.

It is a self number, because there is not a number n which added to its sum of digits gives 1808149420.

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 31 ways as a sum of consecutive naturals, for example, 24417 + ... + 64903.

It is an arithmetic number, because the mean of its divisors is an integer number (51014880).

Almost surely, 2^1808149420 is an apocalyptic number.

1808149420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1808149420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2448714240).

1808149420 is an abundant number, since it is smaller than the sum of its proper divisors (3089279060).

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

1808149420 is a wasteful number, since it uses less digits than its factorization.

1808149420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40543 (or 40541 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1808149420 is about 42522.3402460401. The cubic root of 1808149420 is about 1218.2734288524.

The spelling of 1808149420 in words is "one billion, eight hundred eight million, one hundred forty-nine thousand, four hundred twenty".