440802421 has 6 divisors (see below), whose sum is σ = 442946166. Its totient is φ = 438669000.

The previous prime is 440802389. The next prime is 440802433. The reversal of 440802421 is 124208044.

It can be written as a sum of positive squares in only one way, i.e., 436350321 + 4452100 = 20889^2 + 2110^2 .

It is not a de Polignac number, because 440802421 - 2⁵ = 440802389 is a prime.

It is a super-2 number, since 2×440802421² = 388613548718922482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440802121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39571 + ... + 49471.

It is an arithmetic number, because the mean of its divisors is an integer number (73824361).

Almost surely, 2^440802421 is an apocalyptic number.

It is an amenable number.

440802421 is a deficient number, since it is larger than the sum of its proper divisors (2143745).

440802421 is an frugal number, since it uses more digits than its factorization.

440802421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10323 (or 10112 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 440802421 is about 20995.2952110705. The cubic root of 440802421 is about 761.0525702979.

The spelling of 440802421 in words is "four hundred forty million, eight hundred two thousand, four hundred twenty-one".