253421604 has 72 divisors (see below), whose sum is σ = 672759360. Its totient is φ = 80321472.

The previous prime is 253421599. The next prime is 253421611. The reversal of 253421604 is 406124352.

253421604 is a `hidden beast` number, since 2 + 5 + 34 + 21 + 604 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 68137 + ... + 71759.

It is an arithmetic number, because the mean of its divisors is an integer number (9343880).

Almost surely, 2^253421604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 253421604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336379680).

253421604 is an abundant number, since it is smaller than the sum of its proper divisors (419337756).

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

253421604 is a wasteful number, since it uses less digits than its factorization.

253421604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3729 (or 3724 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 253421604 is about 15919.2212121071. The cubic root of 253421604 is about 632.8214795726.

Adding to 253421604 its reverse (406124352), we get a palindrome (659545956).

The spelling of 253421604 in words is "two hundred fifty-three million, four hundred twenty-one thousand, six hundred four".