402344421 has 8 divisors (see below), whose sum is σ = 548935200. Its totient is φ = 261991632.

The previous prime is 402344417. The next prime is 402344431. The reversal of 402344421 is 124443204.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402344421 - 2² = 402344417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 402344391 and 402344400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402344431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1559346 + ... + 1559603.

It is an arithmetic number, because the mean of its divisors is an integer number (68616900).

Almost surely, 2^402344421 is an apocalyptic number.

It is an amenable number.

402344421 is a deficient number, since it is larger than the sum of its proper divisors (146590779).

402344421 is a wasteful number, since it uses less digits than its factorization.

402344421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3118995.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 402344421 is about 20058.5248959140. The cubic root of 402344421 is about 738.2429833488.

Adding to 402344421 its reverse (124443204), we get a palindrome (526787625).

The spelling of 402344421 in words is "four hundred two million, three hundred forty-four thousand, four hundred twenty-one".