440154221 has 4 divisors (see below), whose sum is σ = 474012252. Its totient is φ = 406296192.

The previous prime is 440154193. The next prime is 440154227. The reversal of 440154221 is 122451044.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35581225 + 404572996 = 5965^2 + 20114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440154221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440154227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16928996 + ... + 16929021.

It is an arithmetic number, because the mean of its divisors is an integer number (118503063).

Almost surely, 2^440154221 is an apocalyptic number.

It is an amenable number.

440154221 is a deficient number, since it is larger than the sum of its proper divisors (33858031).

440154221 is a wasteful number, since it uses less digits than its factorization.

440154221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33858030.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 440154221 is about 20979.8527401886. The cubic root of 440154221 is about 760.6793446708.

The spelling of 440154221 in words is "four hundred forty million, one hundred fifty-four thousand, two hundred twenty-one".