253239493 has 16 divisors (see below), whose sum is σ = 280200816. Its totient is φ = 227381760.

The previous prime is 253239491. The next prime is 253239517. The reversal of 253239493 is 394932352.

It can be written as a sum of positive squares in 8 ways, for example, as 177235969 + 76003524 = 13313^2 + 8718^2 .

It is a cyclic number.

It is not a de Polignac number, because 253239493 - 2¹ = 253239491 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 (253239491) 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 15 ways as a sum of consecutive naturals, for example, 296455 + ... + 297307.

It is an arithmetic number, because the mean of its divisors is an integer number (17512551).

Almost surely, 2^253239493 is an apocalyptic number.

It is an amenable number.

253239493 is a deficient number, since it is larger than the sum of its proper divisors (26961323).

253239493 is a wasteful number, since it uses less digits than its factorization.

253239493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464.

The product of its digits is 174960, while the sum is 40.

The square root of 253239493 is about 15913.5003377635. The cubic root of 253239493 is about 632.6698595493.

It can be divided in two parts, 2532 and 39493, that added together give a square (42025 = 205²).

The spelling of 253239493 in words is "two hundred fifty-three million, two hundred thirty-nine thousand, four hundred ninety-three".