1811049408 has 336 divisors, whose sum is σ = 6299667360. Its totient is φ = 508612608.

The previous prime is 1811049377. The next prime is 1811049421. The reversal of 1811049408 is 8049401181.

It is a tau number, because it is divible by the number of its divisors (336).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 47 ways as a sum of consecutive naturals, for example, 6180910 + ... + 6181202.

It is an arithmetic number, because the mean of its divisors is an integer number (18749010).

Almost surely, 2^1811049408 is an apocalyptic number.

1811049408 is a gapful number since it is divisible by the number (18) 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 1811049408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3149833680).

1811049408 is an abundant number, since it is smaller than the sum of its proper divisors (4488617952).

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

1811049408 is a wasteful number, since it uses less digits than its factorization.

1811049408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1811049408 is about 42556.4261657391. The cubic root of 1811049408 is about 1218.9243874486.

The spelling of 1811049408 in words is "one billion, eight hundred eleven million, forty-nine thousand, four hundred eight".