1808149421 has 24 divisors (see below), whose sum is σ = 2070828000. Its totient is φ = 1573670592.

The previous prime is 1808149417. The next prime is 1808149433. The reversal of 1808149421 is 1249418081.

It is not a de Polignac number, because 1808149421 - 2² = 1808149417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808142421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 734090 + ... + 736548.

It is an arithmetic number, because the mean of its divisors is an integer number (86284500).

Almost surely, 2^1808149421 is an apocalyptic number.

It is an amenable number.

1808149421 is a deficient number, since it is larger than the sum of its proper divisors (262678579).

1808149421 is a wasteful number, since it uses less digits than its factorization.

1808149421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733 (or 2720 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 1808149421 is about 42522.3402577986. The cubic root of 1808149421 is about 1218.2734290770.

The spelling of 1808149421 in words is "one billion, eight hundred eight million, one hundred forty-nine thousand, four hundred twenty-one".