253400517 has 6 divisors (see below), whose sum is σ = 366022982. Its totient is φ = 168933672.

The previous prime is 253400489. The next prime is 253400519. The reversal of 253400517 is 715004352.

It is a happy number.

253400517 is a `hidden beast` number, since 253 + 400 + 5 + 1 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 133957476 + 119443041 = 11574^2 + 10929^2 .

It is not a de Polignac number, because 253400517 - 2¹⁰ = 253399493 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 (253400519) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14077798 + ... + 14077815.

Almost surely, 2^253400517 is an apocalyptic number.

It is an amenable number.

253400517 is a deficient number, since it is larger than the sum of its proper divisors (112622465).

253400517 is a wasteful number, since it uses less digits than its factorization.

253400517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28155619 (or 28155616 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 253400517 is about 15918.5588857786. The cubic root of 253400517 is about 632.8039269035.

Adding to 253400517 its reverse (715004352), we get a palindrome (968404869).

The spelling of 253400517 in words is "two hundred fifty-three million, four hundred thousand, five hundred seventeen".