181838401840 has 40 divisors (see below), whose sum is σ = 424217254608. Its totient is φ = 72487107840.

The previous prime is 181838401783. The next prime is 181838401859. The reversal of 181838401840 is 48104838181.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 3855366 + ... + 3902245.

Almost surely, 2^181838401840 is an apocalyptic number.

181838401840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181838401840 is an abundant number, since it is smaller than the sum of its proper divisors (242378852768).

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

181838401840 is a wasteful number, since it uses less digits than its factorization.

181838401840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7757917 (or 7757911 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 46.

The spelling of 181838401840 in words is "one hundred eighty-one billion, eight hundred thirty-eight million, four hundred one thousand, eight hundred forty".