402221250 has 60 divisors (see below), whose sum is σ = 1089031086. Its totient is φ = 107256000.

The previous prime is 402221189. The next prime is 402221257. The reversal of 402221250 is 52122204.

402221250 is a `hidden beast` number, since 402 + 2 + 212 + 50 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 48066489 + 354154761 = 6933^2 + 18819^2 .

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

It is not an unprimeable number, because it can be changed into a prime (402221257) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 6627 + ... + 29126.

Almost surely, 2^402221250 is an apocalyptic number.

402221250 is an abundant number, since it is smaller than the sum of its proper divisors (686809836).

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

402221250 is a wasteful number, since it uses less digits than its factorization.

402221250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35781 (or 35763 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 402221250 is about 20055.4543703203. The cubic root of 402221250 is about 738.1676420887.

Adding to 402221250 its reverse (52122204), we get a palindrome (454343454).

The spelling of 402221250 in words is "four hundred two million, two hundred twenty-one thousand, two hundred fifty".