253573405 has 4 divisors (see below), whose sum is σ = 304288092. Its totient is φ = 202858720.

The previous prime is 253573399. The next prime is 253573409. The reversal of 253573405 is 504375352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 112296409 + 141276996 = 10597^2 + 11886^2 .

It is a de Polignac number, because none of the positive numbers 2^k-253573405 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 (253573409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25357336 + ... + 25357345.

It is an arithmetic number, because the mean of its divisors is an integer number (76072023).

Almost surely, 2^253573405 is an apocalyptic number.

It is an amenable number.

253573405 is a deficient number, since it is larger than the sum of its proper divisors (50714687).

253573405 is an equidigital number, since it uses as much as digits as its factorization.

253573405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50714686.

The product of its (nonzero) digits is 63000, while the sum is 34.

The square root of 253573405 is about 15923.9883509126. The cubic root of 253573405 is about 632.9478089220.

The spelling of 253573405 in words is "two hundred fifty-three million, five hundred seventy-three thousand, four hundred five".