253763993 has 6 divisors (see below), whose sum is σ = 295194906. Its totient is φ = 217511952.

The previous prime is 253763969. The next prime is 253764029. The reversal of 253763993 is 399367352.

It can be written as a sum of positive squares in only one way, i.e., 241709209 + 12054784 = 15547^2 + 3472^2 .

It is not a de Polignac number, because 253763993 - 2⁶ = 253763929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253763933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2589380 + ... + 2589477.

It is an arithmetic number, because the mean of its divisors is an integer number (49199151).

Almost surely, 2^253763993 is an apocalyptic number.

It is an amenable number.

253763993 is a deficient number, since it is larger than the sum of its proper divisors (41430913).

253763993 is an equidigital number, since it uses as much as digits as its factorization.

253763993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5178871 (or 5178864 counting only the distinct ones).

The product of its digits is 918540, while the sum is 47.

The square root of 253763993 is about 15929.9715316758. The cubic root of 253763993 is about 633.1063455883.

The spelling of 253763993 in words is "two hundred fifty-three million, seven hundred sixty-three thousand, nine hundred ninety-three".