181400492 has 48 divisors (see below), whose sum is σ = 401298240. Its totient is φ = 69818112.

The previous prime is 181400449. The next prime is 181400501. The reversal of 181400492 is 294004181.

It is a super-2 number, since 2×181400492² = 65812276995684128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6734 + ... + 20202.

It is an arithmetic number, because the mean of its divisors is an integer number (8360380).

Almost surely, 2^181400492 is an apocalyptic number.

It is a pronic number, being equal to 13468×13469.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181400492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200649120).

181400492 is an abundant number, since it is smaller than the sum of its proper divisors (219897748).

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

181400492 is a wasteful number, since it uses less digits than its factorization.

181400492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13530 (or 13528 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 181400492 is about 13468.4999907191. The cubic root of 181400492 is about 566.0821841230.

The spelling of 181400492 in words is "one hundred eighty-one million, four hundred thousand, four hundred ninety-two".