253128397 has 4 divisors (see below), whose sum is σ = 254804896. Its totient is φ = 251451900.

The previous prime is 253128389. The next prime is 253128427. The reversal of 253128397 is 793821352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253128397 - 2³ = 253128389 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 (253128367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838023 + ... + 838324.

It is an arithmetic number, because the mean of its divisors is an integer number (63701224).

Almost surely, 2^253128397 is an apocalyptic number.

It is an amenable number.

253128397 is a deficient number, since it is larger than the sum of its proper divisors (1676499).

253128397 is a wasteful number, since it uses less digits than its factorization.

253128397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676498.

The product of its digits is 90720, while the sum is 40.

The square root of 253128397 is about 15910.0093337496. The cubic root of 253128397 is about 632.5773287323.

The spelling of 253128397 in words is "two hundred fifty-three million, one hundred twenty-eight thousand, three hundred ninety-seven".