402411521 has 4 divisors (see below), whose sum is σ = 402456132. Its totient is φ = 402366912.

The previous prime is 402411517. The next prime is 402411523. The reversal of 402411521 is 125114204.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 401441296 + 970225 = 20036^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 402411521 - 2² = 402411517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402411493 and 402411502.

It is not an unprimeable number, because it can be changed into a prime (402411523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3476 + ... + 28581.

It is an arithmetic number, because the mean of its divisors is an integer number (100614033).

Almost surely, 2^402411521 is an apocalyptic number.

It is an amenable number.

402411521 is a deficient number, since it is larger than the sum of its proper divisors (44611).

402411521 is a wasteful number, since it uses less digits than its factorization.

402411521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44610.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 402411521 is about 20060.1974317303. The cubic root of 402411521 is about 738.2840206194.

Adding to 402411521 its reverse (125114204), we get a palindrome (527525725).

The spelling of 402411521 in words is "four hundred two million, four hundred eleven thousand, five hundred twenty-one".