181401240 has 64 divisors (see below), whose sum is σ = 545967360. Its totient is φ = 48216960.

The previous prime is 181401211. The next prime is 181401263. The reversal of 181401240 is 42104181.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 37437 + ... + 42003.

It is an arithmetic number, because the mean of its divisors is an integer number (8530740).

Almost surely, 2^181401240 is an apocalyptic number.

181401240 is a gapful number since it is divisible by the number (10) 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 181401240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272983680).

181401240 is an abundant number, since it is smaller than the sum of its proper divisors (364566120).

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

181401240 is a wasteful number, since it uses less digits than its factorization.

181401240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4912 (or 4908 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 181401240 is about 13468.5277591873. The cubic root of 181401240 is about 566.0829621968.

The spelling of 181401240 in words is "one hundred eighty-one million, four hundred one thousand, two hundred forty".