402121224 has 48 divisors (see below), whose sum is σ = 1101332700. Its totient is φ = 132532224.

The previous prime is 402121219. The next prime is 402121253. The reversal of 402121224 is 422121204.

It can be written as a sum of positive squares in 2 ways, for example, as 393228900 + 8892324 = 19830^2 + 2982^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 402121197 and 402121206.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24969 + ... + 37784.

Almost surely, 2^402121224 is an apocalyptic number.

It is an amenable number.

402121224 is an abundant number, since it is smaller than the sum of its proper divisors (699211476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402121224 is a wasteful number, since it uses less digits than its factorization.

402121224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62854 (or 62847 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 402121224 is about 20052.9604796898. The cubic root of 402121224 is about 738.1064468485.

Adding to 402121224 its reverse (422121204), we get a palindrome (824242428).

The spelling of 402121224 in words is "four hundred two million, one hundred twenty-one thousand, two hundred twenty-four".