402344221 has 4 divisors (see below), whose sum is σ = 419837472. Its totient is φ = 384850972.

The previous prime is 402344191. The next prime is 402344233. The reversal of 402344221 is 122443204.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402344221 - 2¹³ = 402336029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402344192 and 402344201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402344251) 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, 8746591 + ... + 8746636.

It is an arithmetic number, because the mean of its divisors is an integer number (104959368).

Almost surely, 2^402344221 is an apocalyptic number.

It is an amenable number.

402344221 is a deficient number, since it is larger than the sum of its proper divisors (17493251).

402344221 is a wasteful number, since it uses less digits than its factorization.

402344221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17493250.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 402344221 is about 20058.5199105019. The cubic root of 402344221 is about 738.2428610252.

Adding to 402344221 its reverse (122443204), we get a palindrome (524787425).

The spelling of 402344221 in words is "four hundred two million, three hundred forty-four thousand, two hundred twenty-one".