181406898 has 64 divisors (see below), whose sum is σ = 432846720. Its totient is φ = 56111616.

The previous prime is 181406891. The next prime is 181406899. The reversal of 181406898 is 898604181.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (181406891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65661 + ... + 68367.

It is an arithmetic number, because the mean of its divisors is an integer number (6763230).

Almost surely, 2^181406898 is an apocalyptic number.

181406898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 181406898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216423360).

181406898 is an abundant number, since it is smaller than the sum of its proper divisors (251439822).

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

181406898 is a wasteful number, since it uses less digits than its factorization.

181406898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808 (or 2802 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 181406898 is about 13468.7378027787. The cubic root of 181406898 is about 566.0888476106.

The spelling of 181406898 in words is "one hundred eighty-one million, four hundred six thousand, eight hundred ninety-eight".