253806643 has 8 divisors (see below), whose sum is σ = 260865440. Its totient is φ = 246758400.

The previous prime is 253806629. The next prime is 253806649. The reversal of 253806643 is 346608352.

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

It is a cyclic number.

It is not a de Polignac number, because 253806643 - 2⁹ = 253806131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253806649) 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, 93043 + ... + 95731.

It is an arithmetic number, because the mean of its divisors is an integer number (32608180).

Almost surely, 2^253806643 is an apocalyptic number.

253806643 is a deficient number, since it is larger than the sum of its proper divisors (7058797).

253806643 is a wasteful number, since it uses less digits than its factorization.

253806643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 253806643 is about 15931.3101470030. The cubic root of 253806643 is about 633.1418122342.

It can be divided in two parts, 25380 and 6643, that added together give a palindrome (32023).

The spelling of 253806643 in words is "two hundred fifty-three million, eight hundred six thousand, six hundred forty-three".