402544421 has 8 divisors (see below), whose sum is σ = 408038400. Its totient is φ = 397060560.

The previous prime is 402544409. The next prime is 402544427. The reversal of 402544421 is 124445204.

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

It is a cyclic number.

It is not a de Polignac number, because 402544421 - 2⁶ = 402544357 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 (402544427) 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, 111911 + ... + 115451.

It is an arithmetic number, because the mean of its divisors is an integer number (51004800).

Almost surely, 2^402544421 is an apocalyptic number.

It is an amenable number.

402544421 is a deficient number, since it is larger than the sum of its proper divisors (5493979).

402544421 is a wasteful number, since it uses less digits than its factorization.

402544421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5059.

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 402544421 is about 20063.5096879883. The cubic root of 402544421 is about 738.3652866384.

Adding to 402544421 its reverse (124445204), we get a palindrome (526989625).

The spelling of 402544421 in words is "four hundred two million, five hundred forty-four thousand, four hundred twenty-one".