253305805 has 8 divisors (see below), whose sum is σ = 313772544. Its totient is φ = 196107600.

The previous prime is 253305803. The next prime is 253305809. The reversal of 253305805 is 508503352.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 253305805 - 2¹ = 253305803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253305803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816961 + ... + 817270.

It is an arithmetic number, because the mean of its divisors is an integer number (39221568).

Almost surely, 2^253305805 is an apocalyptic number.

It is an amenable number.

253305805 is a deficient number, since it is larger than the sum of its proper divisors (60466739).

253305805 is a wasteful number, since it uses less digits than its factorization.

253305805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634267.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 253305805 is about 15915.5837153401. The cubic root of 253305805 is about 632.7250772957.

The spelling of 253305805 in words is "two hundred fifty-three million, three hundred five thousand, eight hundred five".